I have a redneck-y enough background to have eaten some predators. The meat doesn't taste as good. A lot of it is tougher or stringier. I think pigs are omnivores though, but I don't know what they are fed on farms.
Pigs are omnivores, so they can be fed vegetables or even food leftovers. Grandpa raised a couple of small pigs, they ate corn mixed with vegetable scraps from the kitchen. The pigs got slaughtered and the meat was delicious.
Yes that's the issue with predators, since they run around and use their muscles a lot, the meat is lean and quite hard; it doesn't make for a very tasty meal and the effort required to get this type of meal really isn't warranted.
On top of that, you can't really farm predators, almost by definition (I'm sure you could but that would be very stupid).