The trusty two...
This comparison came as a result of me trying to buy a racquet. I messaged
@ChaseS. about his racquet, someone else offered more and that was that..or was it? No, in fact, it was not. We exchanged some messages and then some more about racquets and strings and soon became internet buddies (my proclamation, not his lol).
A conversation on our personal top 5 strings led him to reveal Solinco Outlast and Kirschbaum Evolution are two of his ol' reliables. Naturally a string trade ensued and the rest is hallowed history....
Power: Straight off the top, Outlast has a more lively response, not all the way powerful but definitely some pop. Evolution is pretty much what you expect from a traditional poly, not dead like the most controlled strings but definitely low-powered. I was actually leaving balls short at first if I had a more defensive swing or sloppy technique. The critical aspect is always 4 hours later...for Outlast the power did keep going up as play time, and tension loss, increased. The last couple sessions were definitely a little more lively than I wanted and while not uncontrollable - and really not even unpredictable - you had to be deliberate in spinning the ball to make sure it stayed in. Some times the power could overwhelm the spin toward the end. For Evo, I much more enjoyed its performance 4 hours later. It loosened up a bit and the string had a little more give and I didn't feel like I was working as hard. The control mostly remained too which is why toward the end I was favoring Evo and playing better with it. It remained more predictable, spin didn't change much but we'll get into that...next!
Spin: This was pretty easy and really got to the foundation and key difference of these two strings. Out of the gate, Outlast was more spinny by nature, felt slicker (slightly), and had the higher launch off the stringbed. All of these did result in noticeably more spin and the tendency to favor that more vertical swing path. When you swung a little flatter the power could take over and result in hitting long. Mind you, these were strung at the same tension in matching racquets, but Evo is a flat hitters dream. Sure, it is poly, it produces spin, but the trajectory and character are so flat. A lot of times when I would swing more vertically it would just launch the ball but when I wanted to flatten a ball it obliged. Unfortunately, that was a key frustration of this comparison....switching back and forth. They were so different in this regard that switching mid-session took a concerted effort and sometimes had mediocre results. It was easier to go to Outlast but when I went from Outlast to Evo is when I netted a lot of balls or launched them. Evo just has different tendencies and they aren't quite as spin based. Sure, with a Nadal-style topspin game you'll get plenty of spin but there are strings that will do it better and easier. As mentioned, power went up with both strings as playtime increased and for Outlast that was a bit of its undoing. The power was able to overwhelm the spin near the end as I think it was losing snap. Evo didn't change much from a spin perspective, it's just more of a control string.
Control: Another easy category, Evo for sure has the control. I didn't have confidence, at first, because I was going back and forth too much. But mid to later on, I'd use just one racquet for a whole session. This is when Evo had loosened up and I felt more confident and was hitting my spots. Similar to having a much more controlled launch angle, this string just favors a little flatter more precise hitting. I always feel a string that complements your style is the best option. I think it could be used to tame a more powerful frame but might not be best if the pattern naturally has a high launch angle. Outlast on the other hand is probably a good middle ground because it has the spin to tame the launch. And that's about the summation of Outlast's control, add spin. As mentioned above, Outlast has some pop but isn't especially a power string but also isn't a spin string, nor a control string. Outlast would lean toward the power/spin side of the spectrum but is a nice all-rounder. As such, control is pretty average and not as good as Evo, especially at 7+ hours. Not wildly unpredictable but just requiring more deliberate hitting.
Feel: This category is by far the most subjective but I try to keep it objective.[?] Outlast is probably the best feeling Solinco string, not overly dampened, a hair crisp and starts firm but softens up a bit. I'd say easily their most forgiving feeling string with the newer HyperG Round being a very close second. I really liked the feel, ultimately it probably still starts out a bit firmer than what I like, and with the pop I'm not sure I'd want to go alot lower, but I could definitely use it as-is. Also would be interested in trying it in a 1.20 guage, might add just a touch of softness. Evo on the other hand is not what I favor. It starts out pretty firm, approaching stiff and loosens up a bit but still maintains that slightly deader feel. I'd say it's more transmissive, meaning you get a bit more direct feel but only marginally. I don't quite put Evo in the 4G category but probably like a Razor Soft or maybe less smooth Big Banger Original. Perhaps even Head Hawk is pretty similar but my points of reference are the 1.30 and 1.20 Hawk, but in that realm. By no means bad but as I said I try to make objective what is very subjective.
Tension maintenance/durability: Tension maintenance for both was pretty good. Outlast got up to 10 hrs and Evo just under 10 hrs, basically my minimum time for comparisons. I definitely could have played them longer but Outlast was not performing as good with the extra power. Evo was doing ok but in the midst of a cold-spell in FL, neither was feeling terrific and it didn't seem worth maxing them out at the expense of playability. Evo was less notched than Outlast which is pretty consistent with Outlast feeling softer, neither was about to break though and provided ample durability. So I'd expect slightly above average tension maintenance while maintaining a good amount of its playability and could probably be played to breaking for those that break poly.
Finale: The main takeaway is just how different these strings are. Not often when I do a comparison does it incite genuine frustration...but this one did. Going back and forth was more detrimental to my game than I've experienced in awhile. The only recent comparo I've done that was similar was my Yonex vs Solinco-braindead hybrid (check that out by the way, in this thread). The Yonex hybrid was so much flatter and less powerful than the Hypermach hybrid. Regardless, these are two good strings. Evo really was not that impressive to me because I have other "basic" polys that I like the feel of better but it's not bad value given the playability duration. Outlast did impress and is definitely one I'd use again and definitely try to pick up a set of 1.20 and see if it can crack my top 5 list. The only downside is Solinco introduced Outlast's chief rival in the form of HyperG Round. Seems there could be a furure comparison there...stay tuned.
Both tested at 50lbs in my Blade 18x19's