Which rooster should we keep?

[Mellowmalt]

I'll put a vote in for the bigger one.
It's a dilemma I am facing at the moment too but my main criteria is the noise they make so if the big one is noisy he'd no longer be the one I'd keep so it's too hard to say from the pictures but the smaller one sounds like he will just get bullied.

 

[Lacy Duckwing]

You could just let him free range. He shouldn't go far away from anybody by himself. This is, as long as you don't have a high predator issue, such as, birds of prey, foxes, neighbors dogs, and etc.