I love showing both standard and bantam!
However, bantam are easier to show.
I'd recommend buying something with clean legs from a reputable breeder. Or starting with something from a hatchery.
There are many good choices. D'Anvers, Dutch bantams, Plymouth Rock bantams, and Wyandotte bantams are good easy to find choices. Easy to train too.
After you start with that you can start to lean toward the more difficult stages like Silkies, Cochins, Brahma bantams and d'Uccles.
Frizzles, Sebrights, Modern Game bantams (require dubbing on males), Leghorns, more rare breeds, and of course the Largefowl next.
(Frizzle isn't a breed in the US. It is a variety within a breed.)