RS Lyon is a great string, I used almost two reels of it myself. However, as a better alternative to Lyon I would suggest Tecnifibre Ice Code, just better in every way, especially being more linear in response and control and better with spin, Lyon visibly lacks spin. Ice Code is also a poly with good pocketing like Lyon, also not too stiff, medium I would say, both are a bit soft for me, but I hit very hard. Because of the good elasticity, I can see it already on the stringing machine - the string simply stretches more, and pocketing, the ball dwells longer on Lyon - same for Ice Code - so I needed to string it a kilo or two higher to not lose control, which isn't a problem, it is never boardy or too stiff, but then I noticeably lose spin with it. As for Ice Code, I tried it in two different racquets, maybe 4-5 strings in total, so I have less experience with it, but my impressions were consistent, in summer and winter etc. Always only 1.25 with both but I plan to try Ice Code in 1.30 in a 16x19 racquet such as RF97A.
However I wouldn't really compare the two with Yonex Poly Tour Pro which is a very distinctive kind of dead-ish string, low powered. YPTP has a nice surface when new so it has nice snapback and feel for the first 20mins or so, but then gradually loses it, and stays a very good, consistent low powered poly with an OK muted/soft-ish feel. It is kind of a hard string, not medium soft like Ice Code or Lyon, but has a specific soft-ish feel. How would it go with 97HD I'm not sure, I think only so-so, because I think that YPTP enables more of a defending counterpunching game, keeping the ball in play kind of style, and attacking only when you get a good chance, while 97HD has more of attacking racquet balance, precision and speed with just enough mass, to always hit hard and fast, in front of the body. Not exactly a type of racquet for a non-attacking player, but all racquets can be modified, and we are all different. But I could be wrong, and I plan to try that and other combos, I have a lot of different strings that kind of accumulated and I've decided to go through it all and reduce the build up.