Okay, are we talking about REAL Ameraucanas or Easter Eggers?
Real Ameraucanas are okay, they're better than your average hatchery laying hen, but not super. They only come up to about 7 lbs at full maturity, and don't have the breast meat like Araucanas do.
Easter Eggers are pretty good, though they vary. I've had a 10 lb cock before from Murray McMurray, and after 2 years of having a troubled hen, she came out to have a lot of breast and leg meat. Very nice birds. But, each hatchery and each bird varies. Some EE's are pretty small, and just as good as dual purpose as your run of the mill "Rhode Island Red" (I call 'em production red though, - nothing dual purpose about them anymore)