My M&P9 Full Size w/ Crimson Trace Laserguard.
I have carried it but it is now strictly a home/range firearm. It's my favorite pistol to date. An amazing and accurate pistol that's ridiculously easy to shoot. I mainly use it to shoot 15-20 yards 3" targets.
Not to brag, but when I shoot, the veterans stop to observe and shower me with compliments that make me blush...I shoot 1 handed, while moving in the tiny stall at the range, hip fire, etc....I usually don't do traditional 2 handed shooting anymore with the fullsize because it gets repetitive/boring putting mags after mags onto a 3" target at 7-10 yards.
My carry is a M&P9C w/ CT which shares some similar characteristics to the full size such as trigger weight and break point. Grip is slightly different but a fairly easy transition between the 2. Muzzle flip and recoil is similar with the advantage given to the Full Size.
Only reason I don't carry the Full Size because the length digs into me when sitting down making it incredibly uncomfortable.