You would think that fish would be healthier than a doughnut (and in some aspects it still is), however the way the fish are fed the fish actually contains more unhealthy fat than a donut.
"All other nutritional content aside, the inflammatory potential of hamburger and pork bacon is lower than the average serving of farmed tilapia."
So the ratio is the most important factor. Omega 6:3 should ideally be 1:1. This is pretty tough to do. Most Americans diet average 20:1.
Here are some common Meats and comparisons for your info
Natural or Grass Fed