Although I carry a 1911 quite a bit, I still favor Glocks while hiking. I like the compact models as opposed to the sub-compact models mainly because I prefer a four finger grip. By the time I add a grip extension to my sub-compact Glock, I only save about .5 inches in slide length which is not really worth it for me.
I don't think pistol caliber matters as much between 9mm, .40, .45 etc as I used to based on the research I have done. I carry both .40 and .45. It's more about shot placement and penetration. The rabid cougar attacks around here I have read about lead me to believe that these sick critters don't really stop the attack until they cease breathing. This suggests to me that whatever you can be most accurate with in delivering a round in to the brain cavity is the best solution.
I have seen a couple of "bob cats" out here and they wanted nothing to do with me. Beautiful critters though.