I theoretically love 40 fps lol. Never properly experienced it as I don't have a 120hz display. But it just seems like a solid middle ground to me, coz I'm not a fan of the "soap opera" feel of some games with 60 fps and higher. It just depends on the genre/game. I do much prefer playing fighters, racers, and platformers at 60+ fps.
30 fps on the other is a bit choppy even when it's done perfectly. Has a nice cinematic feel to it, but it's not as responsive as 60+ which is smoother but doesn't convey "epic" as well as lower framerates imo.
40 fps would also leave more resources to be used on graphical fidelity/animations/physics/mechanics, so it's a win-win for less reaction based games as far as I'm concerned.








