I'd got with the broiler cross. It's called a Cornish Cross, Broiler bird, Cornish-Rock cross. Many things that mean the same thing.
These birds will get very large very fast. About 6-8 lbs. in about 6-8 weeks. They have very good feed conversion so little to no feed is wasted. They are LAZY so confinement is a must if you have predators that like the taste of chicken.
These birds must NOT roost because their large size could cause leg problems in birds that hop down from roosts. They will be just as happy to roost on the ground.
6-8 weeks and you'll have delicious, tender meat. Nice breast meat and nice leg meat.