What didn't you like about the barred rock? I haven't had one ever that wasn't the picture of chicken health, and the queens of the layers. They held their own against hybrids.. their eggs were a tad smaller, but they laid just as frequently.
I don't really know, to be honest. Sometimes it's just a gut thing. They're less adventurous than the EE's, but not as responsive to the rooster's warnings (although moreso than the Gold Stars). They laid well. But I don't know. It's weird because they were one of the breeds I was most excited to get, but my least favorites. I just can't quantify why. Perhaps my experience would have been better with BRs from a breeder. I know mine weren't perfectly healthy- one died in the nest box last summer, with the only previous symptom being a pale comb a few days before. BUT I don't love the hatchery they came from (Hoovers in IA). I've had good chicks from them, but I've also had disastrous batches of chicks from them.