SteelSeries Sensei Vs. Corsair M65

Looking for feedback on both mice or which ones better.
I rifle and play on 500 DPI & 3 in game sensitivity.

http://www.amazon.com/gp/aw/d/B005L38QLQ

OR

http://www.amazon.com/gp/aw/d/B00ARD5410
Would the sniper button be useful in any situation?

Also what are the pros or cons of a laser mouse?

Best mousepad for a laser mouse? Qck+ or M200CORSAIR or something else?

Any other good mice for rifling at low sens ?
I already have a deathadder 2012.
I got larger than average sized hands but not by a lot.

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