I have bantams and large fowl. I've really fallen in love with the bantams because of these reasons:
They're super cute!
They take up less space than a large fowl
They still lay eggs, just use more of them when you cook
For little children, they're not so intimidating!
Did I mention they're super cute?
I think I'm biased.....I never thought I'd like the bantams until I got a few.....I have a silkie, two frizzle cochins, and two Polish. A few days ago, I just hatched out twelve more bantam babies and they are so friendly and adoreable! (3 more polish and 9 cochins...)
SO I VOTE BANTAM!
Large fowl are wonderful too. You get bigger eggs, you don't have to worry as much about predators, once they reach their adult size....Where the bantams are always more vulnerable.
So that's my personal opinion, but I know you will enjoy either! Just raise them from little chicks so the kids will enjoy them and get to know them.