I'll also vote for New Hampshire. I have always been happy to raise hatchery or breeder-sourced New Hampshires.
Right now I've got 40+ 7-week old chicks from Cackle in the grow-out pen. There are Chantecler, New Hampshire, Delaware, White Rock, Columbian Rock, Naked Neck, Marans and several other breeds. The New Hampshire pullets (no cockerels) are bigger than any other chicks, including the Columbian Rock cockerels. The Delaware and White Rock look like little butterballs, but they are smaller than the New Hampshires.
I got some pretty German New Hampshires from a breeder here on BYC a couple years ago--I was very happy with them but they seemed prone to gout with our alkaline soils and hard water. I have one left--she is beautiful and causes no problems in the flock.
However, personality wise I think the Chantecler cockerels are significantly calmer than the New Hampshire cockerels. I couldn't process the New Hampshires soon enough; and despite wanting to get some fertilized eggs in the incubator, I couldn't tolerate any long enough to make it to the pullets laying. Meanwhile, a White Chantecler rooster was the longest lived rooster on my property at over a year old before the crowing drove me bananas.
ETA: I don't weigh any birds at processing. If pressed, I'd say the New Hampshires were bigger at a younger age than the Chanteclers. Regardless, I'd be hard pressed to recommend one over the other besides aesthetics of color and comb.
Edited by popsicle - 5/5/16 at 9:53am