Meat all the way baby! It's a moral decision really, I can't bear to kill those poor defenseless plants.
In all seriousness I love meat, but try to enjoy it in moderation: sensible portion sizes, and plenty of non-meat protein in the diet. I eat more chicken than beef, plus a decent amount of cheese and eggs.
There is an ecological argument for meat consumption within a system of sustainable agriculture that basically goes: "we can't eat grass/worms/whatever, but we can raise creatures that can, and eat them" ... I know this doesn't apply to modern agriculture, but it's still interesting.