I have the M&P .40
You won't go wrong with either.
I have one with and one without the mag release safety. I would recommend NOT getting one with a mag release safety. I do not have thumb safety as it wasn't initially available. That being said, I WOULD get one now. Can't hurt.
Never had a single feed issue with any type of ammo used, dead on with Trijicon nights, and Hogue grips on Medium sized backstrap.
The Day You Get Comfortable Is The Day You Get Careless...