Sardines w/ chiles without a doubt! Love ‘em on saltines.
I’ll take the sardines or the mackeral. One thing I did find interesting, though: The sardine cans have 200 calories while the mackerel, in the same sized can, and the same olive oil, only has 130 calories.
I did some internet reading and was really surprised about just how healthy these two protein sources are. Amazingly so.