Listen to this guy !
Exactly, Kitebord is right.
Two of the old ATP pro's from my country get their racquets strung at the same place as I use for stringing, and at one time they constantly changed between VS Touch 16 mains/Alu Power crosses and Alu Power mains/VS Touch crosses.
As mentioned, several pro players experiment with gut mains/poly crosses and poly mains/gut crosses. The feel is different, but to call it polar opposites is just not correct in my view.
I talked a bit with Djokovics old stringer, who used to string for him. 2-3 years ago Djokovic had full X-one, then changed to Alu mains and VS crosses. But now he seems to be stuck at VS mains and Alu power crosses.
You also saw Djokovic change from a Head with 16x19 string pattern during one part of the season to a Head with 18x20 string pattern during the other half of the season.
One could say that his results as of lately have sucked, but he still is a VERY solid Top 5 player all year round, and he does change the gear he uses quite often for a pro player
I will probably go with X-One mains/BlackCode crosses in the colder part of the outdoor season and indoor season and then change to BlackCode mains and X-One crosses during the hotter summer season.
I have my 6 mains racquets strung with VS Team 17 mains and Alu Power crosses at the moment (dumped RPM Blast - found I still preferred Alu Power and Silverstring 1.20).
But I need 2 extra racquets for wet weather/rainy conditions and also for wall practice (need something less powerful for wall practice than nat gut mains) and found the BlackCode mains and X-One crosses excellent for that.
I also do some experimenting with full poly BlackCode 1.18 mains and Silverstring 1.20 crosses at very low tension - 16-18 kg/36-38 lbs.
Trying out new string combos is part of why I play tennis and why I find it fun to go to the courts........