Pretty much any breed is going to have positive traits. I'm moving all of mine toward peacomb or small single comb. One of my young girls doesn't appear to have a comb as such, just a tiny lump of red. We'll see how she does. I suspect she'll struggle during the summer.
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The small single comb seems to have appeared naturally, but only for the hens. The boys still have a pretty large comb so I've got a lot of frostbite right now.
Traits seem to combine in different ways as I get into the future generations mixing. The pullet mentioned above is JG/RIR/Buckeye but her siblings look much the same even though the mothers are different.
I still have several generations to go before I start letting the chickens sort out their own genetics.
The Buckeye brought in the peacomb. JG for size. RIR and BA for laying ability and early maturity. Biel for size and temperament, although that didn't work out as planned. At the moment it's a celebration of survival. Rangers...we'll see. Several breeds couldn't hack it for one reason or another.
This spring I'll be bringing in reliable broodies and strong foragers, two of which prefer tree roosting. I may be able to start transitioning to a fully free range flock.
Each breed brings something to the table, and you really won't know what the results will be for several generations.
Edit to note that I'm not focusing on appearance at all, so that makes a difference.