deathadder was easily the most nice feeling shaped mouse I've ever had. however, the mousewheel was a severe issue.
I was recommended the zowie fk1 but the shape wasn't as comfortable. i honestly couldn't tell you if my mouse movements were better or worse.
currently using the g903, not a fan of the open crevices. the wired/wireless option is nice.
if we're talking about peripherals, 144hz is too nice not to have for fast-paced gaming. although that changes this topic from a $50-$120 mouse upgrade, to a $150-$400 monitor upgrade.