If your goal is to work to SOP, I would consider getting some birds from a serious breeder of this variety. The birds you have now look like typical hatchery males with serious faults that would get them disqualified or lose points at shows ie pinched tails, and poor leg feathering to name two. If you just want to have a good flock of backyard birds that you can gradually work on for years that's fine, just be aware that it will take YEARS to get good birds out of the males in the picture. Also, as to choosing between them, if you want to breed seriously you will need more than one male at all times for genetic diversity. So it might be best to keep both as this breed is known to be docile and males should coexist perfectly fine when raised together. I would say if you must get rid of one of those males you should wait a couple of months for them to mature as Brahmas are slow growers and then make your choice when you can get a good look at their color and type.
That said, I think that red band looks to be the more healthy bird judging from his head and leg color but that is hard to tell from the picture. Both birds are lacking in leg feathering and both birds narrow badly towards their tail. There does seem to be some brassy tinge to the feathers on red band which is also something you could look at. Dark Brahma males should have a clear silvery white base color (except of course the black areas). My own experience from hatchery birds says that they are probably both undersize for the breed but that is also hard to judge from the pictures and given how young they are. If I was in your position I would focus on finding males without that narrowness toward the tail. Also, both birds need to be wider overall. Brahmas should have great width going all the way from shoulders to tail. Anyway, best of luck with them!
