Hi,in my opinion if you try raising any pure breads such as the buff orpington , light sussex or road Island red for meat you will be very disappointed,the breasts contain about as much meat as an oyster each,by the time they get to a decent size 24-26 weeks or more the legs are as tough as old boots and are only suitable for long slow stewing.
The Indian Game bird is very nice,It has a double breast which is why it is used in the makeup of modern meat chickens.The IG has plenty of meat on it but it can be a little gamey for some peoples taste.the other pure bread is the Ixworth which was bread from the IG any way nice bird and not so gamey,ready in 24-26 week,then you have the French Le Bresse,a similar bird to the Ixworth,but some would say better tasting.
Then you come to cross breeds or hybrids.IG or Cornish as the americans call it crossed with LS,RIR or Plymouth Rock are all very good you get the double breast of the IG but over the larger frame of one of the above,also not as gamey and is the make up of the modern broiler.
If you don't wont all the bother of crossing birds or the gamey taste of the IG or the long wait for the Le Bresse.The Hubbard is very good.
I don't know why the French wouldn't like them thats where they come from,and if raised correctly the meat is loverly and firm with plenty of fiber.
The ones in the supermarkets are kept under lights so the eat 24/7 they are then killed at 6 to 8 weeks old so of coarse the flesh is soft and tasteless they are only baby's,a bit like veal.
I raise mine outside,and am very careful with there diet,if they start growing too quickly cut them back a bit.I then Kill them at 12 to 18 weeks,by 18 weeks they are fully grown.
Graham.