I shoot both, I am equally comfortable either way. I do like the higher capacity of the auto, however the longer I carry the harder it is for me to want to do anything but put that airweight snub with crimson trace grips in my front right pocket. It is so convenient. It is not so much a size thing as it is a size and weight combined thing. A light weight snub really is the sweet spot for carry.
Don't get me wrong like everyone else I adjust based on where I am going, etc. If it is a less familiar place or far from home a Glock 30 with 10 rounds of .45acp and an extra mag (maybe even a 13 rounder) goes with me. Otherwise I generally tend to carry a snub iwb or on hip with a Keltec P3AT or P32 to back it up. Just in case I need those extra rounds, and I pray I don't need the first 5.
Glock is like the revolver of the auto world to me and if they ever make a Glock 26 sized or smaller pocket 9mm or .40 that is 5+1 or better and only 15oz. unloaded (and as reliable as my full size Glocks and revolvers are), I will have a hard time not making that my primary daily carry.
Until then, 90% of the time I walk out the door I have a S&W airweight on me. YMMV of course but I actually shoot snubs very well at typical SD ranges (10 yards and less).
As a side note, I am impressed with how many revolver guys there are on this forum!