I'm more caliber driven than anything else. Capacity is nice, but if it were pure capacity, the Calico pistol with the 100 round helical magazine would be all I'd want (OK, a selective fire American 180 would be better). I'm quite happy with my 8 shot magazine Sig P220. Carried it for years over a 15 round magazine firearm.
BTW, I also have a Glock M21 and a ParaOrdnance, both of which have higher capacity than the Sig P220. I'm still more comfortable with the Sig because of my small hands and the fact that I've trained more with the Sig than any other pistol.
Vigilantibus et non dormientibus jura subveniunt. Molon Labe!