Meat defo.
I started feeding dry, then as I realised its complete and utter shit, I moved to pet mince, realising that was OK but not perfect now feed them anything really, hearts, chicken, pheasent, rabbit, pigeon and squirrel (if i can get it).
There looking much better on it. They feel more chunky and muscly, and nice coats.
Also they dont drink 5 tons of water every day!
Only downside to meat I think is that they always drag it into there bedding and get it all wet, meening it has to be changed more.