I'm on a bit of a health kick right now, and am diggin' canned tuna. Which is the best/healthiest?

I hardly eat red meat/chicken anymore (Once in a blue moon). For a snack, or lunch, I love me some tuna (a bit of pepper on top). At work or when I want a quick snack, I’ll reach for a can of tuna. I prefer the chunk tuna packed in water.