Welcome to the forum from north Florida. You are right to try an make sure your choice will actually cook what you want, both volume and quantity (quality will be up to you). Might I suggest you visit a few local comps and take a look at the cookers before jumping in. Looks like you are near the Dallas metro area, I bet in 2-3 weekends you would get to see a pretty good variety of the cookers you mentioned, talk with folks that use them and maybe even sample some Q. I know you said you were interested in backyard cooking (not comps) but visiting a BBQ contest or two will let you see a pretty good concentration of cookers at one place - and they are fun.
Weber 26.75 OTG w/CI grates & SJ/WSM Mini
Home built 24"x72" reverse flow stick burner trailer with 18"x44" grill w/CI grates and upright SS gas oven/smoker.
Home built 48" fire pit with a 30"x30" Santa Maria style ranch grill.
Home built lump charcoal retort, iGrill & a bunch of other cooking toys.