Usually I carry my S&W 457 (.45), even though it's technically a "compact" gun (hardy-har-har) it's a big pistol. But Ima big guy. I can hide a full size "assault" rifle in my belly button alone. So no biggie.
Lately I've been carrying my S&W 5906T (9mm) a lot. Not really sure why I changed myself, other than maybe the extra 8 bullets give me piece of mind I guess...
BTW: If you haven't guessed I'm a sucker for the old S&W steel frames.