The great glock debate really boils down to the grip angle, some shoot it very well and it is indeed a good design. Others who have shot the 1911 find the XD and the M&P a better fit. All three are fantastic combat weapons and serve the role of personal protection very well.
Not knocking others, all three of those are mid-level priced and because of that, probably the most common carry weapon these days.
I remain a fan of the 1911, but enjoy my XD's every bit as much. I am not a fan of the Glock, simply because I remain unused to the grip angle, that does not make it a bad weapon, just one I have opted not to make the adjustment to shooting enough to have become comfortable with it. There is good science behind it and from what I have observed in the pistol owners, most who do not praise the glock are revolver shooters in their current or past history.
Everyone who is considering a carry weapon should most certainly go to a range and rent a variety to determine which suits them best, after all, you are about to plunk a large chunk of change down for it and you are indeed possibly trusting your life to it, have the best for YOU at that moment.
I would trust my life to the 686-4 without hesitation, but do prefer a few more rounds.