Flemish Giants have a poor meat to bone ratio and are slower to mature (as well as eating more and needing bigger housing). We have a couple FGs but mainly because my husband likes big rabbits, not so much for their meat. We also have a Californian (who I believe is mixed with New Zealand) who is OK, but some people who have raised them say they will bite and latch on for no real reason. They are good meat producers and are popular commercially because the pelts can used for making garments (white is popular for rabbit coats, but the white can also be dyed easily to another color), so they are money makers for commercial breeders.
Unless you're going commercial, I suggest looking at other breeds before making a final choice (being a small/private rabbitry, you can choose whatever rabbits suit you, including mixes). Silver Foxes are generally good natured and good mothers to their kits. They can be a little hard to locate, but are worth the extra effort to find. Palominos, I am told, are another good choice. Some people really like the Rex for their soft fur and nice personalities.
I agree, chickens can be a pain the a--! I won't bore you with my tales, but I'm not into chickens (aka jerks that shit everywhere). I don't mind eating them, but I don't know that I would want to raise any. I would much rather have ducks. Rabbits are such easy keepers compared to poultry!