Win10 for me, I usually wait like 3 years+ before switching to new window. Too many bloatware from Microsoft and you want them to iron out all the bugs. Not even taking into account all the compatibility issue that might arise and I wouldn't want to deal with that.
WIN 10 offcourse, cuz it's been years since it's release and have not bugs, not saying that WIN 11 is not good, no it's actually great and i have tried it myself, it may have some flaws but it will be fixed in the next couple of months, Both systems are great and u have to try both in gaming and see for ur self, it's ur doings that's gonna decide which system u shall use.