I noticed the difference from 60hz to 100hz, but I was disappointed when I saw a friend's 144hz monitor as to me, I couldn't really notice much difference.
Currently I would not move away from 3440x1440 @ 100hz. For gaming I find the ultrawide experience trumps Hz.
I agree, I’m getting around 90hz on Ultrawide, and with g-sync it’s just incredible. When I upgrade gpu (7nm) I look forward to 120hz, but up to 100hz is spot on for me, any extra is harder to see. I’d take Ultrawide curved over anything at this point, it’s just the balls.