The white ones I think are cornish cross (meat birds) and the red ones are....well.......red ones lol. I see a pretty good comb one one, so don't think they're sex-links, maybe rir or production reds.
ummmm, are they the same age? The white ones look like behemoths compared to the red stars (RIR?)...so I would have to say red stars and cornish cross meat birds.
Yep, have to agree. The whites are Cornish cross (aka "meaties"). They look so much bigger than the reds because they are meat birds and meant to grow extremely fast. They are expected to be at butcher size by about 6-8 weeks old.