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Armpits are suppose to be hairy on a man, and trimming makes it look unatural! Men should be hairy, and trimming chest hair and pubes is a diff thing! Keep the pit natural!
It's true. In the Turkish Army if you have hairy pits you'll get a punishment. It's more hygienic because the bacteria which cause BO have no place to live. Or let's say less place to live.I'll add my 2cents here. Since I started shaving I've noticed less sweat and less odor. I shave them or have them waxed and use deodorant as usual (Speed Stick) and I find it much more comfortable than leaving the hair there.
Also, I noticed that more guys shave their pits in Central/Eastern Europe than the US. Not sure why but in the gym showers in Prague, 7 out of 10 guys will be smooth. In the US it's more like 1 of 10.