When it comes to hand-guns, the highest capacity in my collection is my 1911 (with a couple 8 rounders). Mostly revolvers or carry-sized guns with around 6 rounds in it. I'm mostly into 45's,though; a similar gun in 9 or 40 might tip that ammo count.
When it comes to rifles, I've a bit of everything. For my AR and Mini-14, though, I generally prefer 20 round mags over the 30. I just use them for fun and punching paper, so I rarely load more than 10 at a time anyway. A fully loaded 30 rounder just makes for more money down range in less time.
“There are three reasons to own a gun. To protect yourself and your family, to hunt dangerous and delicious animals, and to keep the King of England out of your face.” - Krusty the Clown