Hahaha. I don't have one of everything. I wish I had that kind of money to spend on guns. I have a 10-shot 3" .45, a 12-shot 3.5" .45, and 14-shot 5" .45. I'm just missing the 13-shot 4.25" .45. I like the full sized one the best because I built it myself and after 20 years it's like an old friend. I have a sentimental attachment to it and it works great with my Carbine Conversion Unit. I haven't shot the LDA 12-.45 enough to have an opinion other than I love the trigger, the size, and the way it feels in my hand. The P-10 is nice too and I can get all my fingers on it since I got the Pearce grip extensions, but the 12-shot with an extra 1/2" of barrel is a lot better. If I knew how good the 12-shot compact would feel in my hand I wouldn't have got the 10-shot sub-compact. It's becoming my favorite.
Any Para high-cap pistol that comes with a 10-round restricted-capacity mag instead of the normal capacity can take the other mags too. You can also use 14, 15, and aftermarket 20-round mags in any of them. And you can use 12-round mags in a P-10, 13-round mags in a 12-shot pistol, 14-round mags in a Tac-Four, etc. They may wiggle around a bit and
may cause an occasional malfunction, but it works as an emergency backup. Plus it's just fun to put a 20-round mag in a 3" pistol and blast away.
P.S. The only reason I used the Warthog as my avatar is because I didn't have to shink the picture down as much.