Everyone is going to give a different opinion, and everyone has very different hands and styles for using their mice. I have been an avid LoL player for a few years (too busy to play nowadays unfortunately
) and have gone through a good number of mice. Though some people call it bunk, I found my skillshots and accuracy to improve significantly with an true optical sensor. I have used a Deathadder, Sensei Raw, Roccat Savu, Corsair M95, Zowie FK and others, and my two favorites were the Roccat, the Zowie, and the Deathadder. Coincidentally (or not), those are the three with the optical sensor vs laser in the others.
I actually noticed that the laser mice felt weird to me after using an optical mouse before I knew anything about the sensors, so there's definitely something to it. I just feel like the mouse does exactly what I want it to with an optical mouse. Anyway, I would HIGHLY recommend Zowie mice. They're pricey, but they have flawless sensors, are high quality, and don't require any extra software. They're completely plug n' play. You can change the DPI and polling settings directly in the hardware! I've HATED having to use the various softwares that come with other mice to change settings (the SteelSeries one even caused my PC to crash on numerous occasions).
My current setup is a Zowie FK and a standard SteelSeries Qck. Never been happier with my mouse setup
If you're looking for something more similar to the Deather, you can also check out the Zowie EV eVO's. Anyway, sorry for the long post, but that's my 2 cents. GL!