I'd keep the bigger one (A) if these were my 2 options.
Let me preface this with I'm no expert but I'll tag someone with much better knowledge to help out.
I'll also say that it is way too early to know which one will be the better of the 2. I don't make any selections in my BCM males before 19 weeks of age. They are growing and changing too much.
With that here's my early opinion.
Cockerel A is bigger obviously. They both have too much copper in the chest. It might molt out by 18 months, it may not. If it doesn't you want to mate these to your females with little to no copper in their hackles. This should produce correct full copper in the progeny. (Think balance....over colored x under colored)
I like A's leg stance better than B's. It's not as wide as it should be but better.
I like his tail angle also. He might be just a tad long in the back but could be just the pic.
B's comb looks slightly better but that's an easy fix.
Like said, they're going to change too much for me to make a good judgement call but working with what you have, I like A the best.
@BlueTheBrahma what's your thoughts?