I've only use 2 gaming mice so far. I've tried the R.A.T but its a piece of shit. Dont get it.
The first one I used was the G700 (which is now the G700S, both shown below)
But after 4 years, left click started failing. Otherwise, it's most comfortable mouse I've ever used. Its hybrid wired with a very good wireless connection (hybrid as in you can plug it in and get wired responsiveness) and is quite versatile in regards to buttons and macros.
I now rock the G502 (bottom mouse in pic)
Not as comfortable as the G700 (but my hand is big so that could be why) however it's so responsive and works similarily to the G700 in regards to buttons and stuff. The G502 has a DPI shift button you can hold to change your DPI while it's held (trying to aim a gun and reducing mouse sensitivity). It's also permanently wired with logitechs fabric no drag cable which feels ALMOST wireless. It also has customizable weights in the bottom so you can set your mouse weight and center of gravity. VERY nice feature imo as I prefer a more rear center of gravity.
What mouse do I recommend? Idk. They're both amazing. It all depends on what you want and what you can afford.