I'm not saying it is the best choice for everyone, but I sold my G20 after buying a G29. I'd had the G20 for years and liked it a lot. I got a chance to buy a G29 at a good price and had both for a while. I just found myself reaching for the smaller gun more often. I shot them both equally well and I can use 15 round mags in the G29. Being able to mount a light while camping is important to me.
The 10mm is a niche gun for me. I like it, but don't shoot it enough to justify handloading for it. I'm well stocked on factory ammo. The last I bought was priced the same as 45 ACP and a friend gave me several hundred rounds of 40 S&W. It shot just fine in both guns with no modifications.
I bought a couple of boxes of DoubleTap 200 gr hardcast for it several years ago. It chronographed 1315 fps from my G20. I haven't tried the G29, but DoubleTap claims 1250 from the shorter barrel and 1300 from the G20. My G20 was right on the money so I'd expect the G29 should be too.
If concealment is important, I carry it with the 10 round mags. Otherwise, the 15 round mags with a grip sleeve.
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