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Yes, RSL is Red Sex Link. Sex Link isn't a breed, it's a hybrid mixture of two different breeds, producing chicks which can be sexed by the difference in color. The males are entirely a different color than the females.
Orpingtons are the breed, Buff is the color. They're pretty good layers. I love my Buff Orpington - she went broody last year and hatched my first GrandChick! She's gorgeous, with a big fluffy butt.
The Plymouth Rock - Barred, commonly called Barred Rocks, are excellent layers and I think they're very pretty. I love mine. Talkative, followed me around, very personable.
Bantams, for the most part, are bred down from larger fowl breeds, except for a few breeds which are ONLY found in the bantam size. (Silver Sebrights, Golden Sebrights, for example.) Often very good layers, but not so good as meat chickens because they're so much smaller.
Delaware is a GREAT breed of chicken! Friendly, great layers, pretty large birds.
I don't have any New Hampshires.
RIR can be aggressive. Mine is pushy. In multiples, RIRs can be quite bullying towards other chickens.
Every chicken, like every animal or person, is an individual. Contradictory information comes from those differences.