I've owned the Steelseries Sensei RAW, the Logitech G502 Proteus Spectrum, and now the Razer Deathadder Chroma.
To be honest, you really can't go wrong with any of them. I liked the Steelseries for its simplicity and lack of reliance on software, but it didn't fit my large hands quite right. I liked the G502 for its amazing sensor and shape, but it was a little too heavy for my tastes and look too gaudy and gamer-y. The Deathadder ended up being the one for me because it's lightweight, fits perfectly in my large hands, has a fantastic sensor, and an understated look. Still, I'd recommend any of the mice if asked.