M4G is right - but there's no reason you can't breed for both. In commercial rabbits, show quality generally translates usually to fine bone, and bulk where it counts - the parts of the rabbit you'll be eating. I don't raise meat rabbits (yet) but I still select for most of the same things - I'm not going to keep a rabbit who has small litters every time, or one who has large litters but can only raise about half of them, nor am I going to keep any of her daughters.
Picking the best in the litter is an acquired skill, though. My first couple litters I kept everything, let them grow a little, then took them to a show and entered them all, knowing they wouldn't compete against the seniors. Then, I listened to what the judges had to say! Took notes, kept the placements and comments in mind and cross referenced them with what I knew I was looking for. Then the decision was easy.
Then you learn as you go. You don't need a judge to tell you that this rabbit lacks fullness in the hindquarters, or that the other one is full to the table, or that one peaks late, because you can see it yourself. Knowing your herd, what it lacks and what it has in abundance is key to selecting for improvement. If your rabbits have weak hindquarters, and produce one that is much fuller, hey, that's improvement, and that's a keeper!
Hope that helps a little!