Well it hasn't been said yet, and every 10mm thread must have a post about this so how about the 45 Super?
Although not available on the shelves in most places, if you reload it's easy. Also I have to say that EVERYONE here has a computer and with a few clicks you can order just about anything you want to your front doorstep.
With a few minor parts change like an EGW flatbottom firing pin stop and a 23-25# mainspring, extra power firing pin spring, 18-24# recoil spring, you can have large variation of ammo. 45, 45+p, 45 Super, and target loads are available just about anywhere with a few changes to the recoil spring for the proper load.
Don't give me the crap about proper cycling for all ammo, you wouldn't expect a .40 S&W to cycle with the same setup as a 10mm now would you? You would have to change the barrel and recoil springs too.
If you reload either is an option. I don't yet have a 10mm, have considered it, might still consider it in the future. I find that with premium ammo the choice is kinda moot point.
And if you want to pit one auto against another then my 460 Rowland kicks the crap out of the 10mm
Here are some specs from buffalo bore's site.
10mm
180 gr. Speer Uni Core - J.H.P. (1,350fps/M.E. 728 ft.lbs.)
200 gr. F.M.J. - F.N. (1,200fps/M.E. 639 ft.lbs.)
45 Super
185 gr. JHP @1300 fps (694 ft. lbs.)
200 gr. JHP @ 1200 fps (639 ft. lbs.)
230 gr. JHP @1100 fps (618 ft. lbs.)
45ACP +P
185 gr. JHP @ 1150 fps (543 ft. lbs.)
200 gr. JHP @ 1050 fps (490 ft. lbs.)
230 gr. JHP @ 950 fps (461 ft. lbs.)
and my favorite...the 460 Rowland
185 gr. JHP @ 1521 fps (951 ft. lbs.) OUCH!
200 gr. JHP @ 1483 fps (977 ft. lbs.) OUCH!
230 gr. JHP @ 1333 fps (908 ft. lbs.) OUCH!
260 gr. JHP @ 1148 fps (761 ft. lbs.) OUCH!
Not only is there the ability for heavier loads but the 45 ACP can also be found with grain weights as low as 110 from aguila.
The 45 is just diverse. Now if you want to get into the gritty, the 45 makes a slightly bigger hole, shorter case for smaller grip size (barely) but I can't get my hand comfortably around the glock. Lower pressure, lower recoil, extended gun life (ya I know you can argue both ways).
Higher capacity? Well that would depend on what mag you were using and gun. My XD-45 has 14rd capacity so?
Let's not forget that faster lighter bullets tend NOT to penetrate as much. I kinda prefer a bit of penetration IMHO. Now don't get me wrong I don't run around with FMJ's all the time either...Heavier bullets break bones better and stay on course. If you have to bust through the breast plate (sternum) to get to the goodies a heavier bullet will accomplish the job better (in any caliber)
If you notice that the 200 grain loads for 45 Super and the 10mm are EXACTLY the same.
And I might add that unless you are packing a 460 S&W mag that handgun velocities will not give that devastating soft tissue damage like a rifle.
The ballistics are very close to the same, I haven't heard of anyone complain about 50 fpe either way.
I would also like to throw in that (correct me if I am wrong) but I have not seen any 3inch 10mm? No micro compacts, nada. So if you are talking about variation in the firearm as well I would once again choose the 45. Not that I own any SB 45's just that many, many prefer them, especially for carry options. If you want the 10mm for hunting great!~I'll stick to my wheel guns with the big boom for that.
This is just yet another variation of the big and slow vs the small and fast. But truth be told there are too many variables to consider, gender, age, pistol size, group size, engagement (like the argument about more energy at 100 yards, BFD unless you plan on hunting with it, I will not be engaging anyone at 100+ yards with my pistol thank you), recoil, follow up shots, ammo cost, magazines, level of shooter ability, and many, many more variables.
Given all these I would have to say that with any given variations of the above MORE matches would fall into the 45 category than the 10mm.
That being said...if you want to sell your 10mm cheap let me know (no glocks)