No purebreed is very satisfying as a "meat bird". They don't have the body conformation, growth rates or FCR's to make them practical. If you look at the ammount of time and feed you have to put into a heavy breed cockrel (or pullet) to reach slaughter size, 15+ weeks, you are better off buying organic, free range, raised on cushions from Whole Foods.
The only satisfying broilers are hybrids. There are alternatives to raising Cornish Crosses which don't have the associated problems, but will still form meaty carcasses. Just browse the first few pages here.
If you truly want to make your own meat birds in the backyard, you need to get a Cornish Rooster (or better yet, two or three). You can use them to sire any fertile eggs you produce and you will get far better results doing your own home 'Cornish Crosses' than with any purebreed out there. A Cornish X Deleware sounds very promising.