i own an XD45ACP Standard.. so, i voted XD.. i'm impressed.. the only thing about the XDs are the trigger.. it's a long pull, and the reset is also long.. if SA would take some slack out of it, it would be great.. the sights are immensely hard to adjust or remove.. the early models have rust problems due to the finish, but SA will refinish the earlier non-melonite XDs that show pitting/rust for free.. the lack of an XD45ACP-SC is irritating.. the XD45C is a compromise on not having a SC model.. the lack of aftermarket parts is a reality with the XD.. for all the shortcomings of the XD, it's a very competent combat pistol..
the M&P is really, really nice and i wouldn't mind having one, but there are a few problems with it that i can't ignore.. 1) 10 rounds.. 2) the trigger is very gritty feeling (the pistol that i fired had less than 300 rounds though it, so i'm sure that it would be less so with more through it) 3) the field stripping procedure with the internal lever.. other than that, it's a beautiful pistol.. it's well balanced.. i like the slide serrations, very positive grip..
as for Glocks.. i don't like the grip angle, or shape.. and that's pretty much it..