If I could catch only one type of fish for the rest of my life, I'd have to choose bream, for three reasons.
1) They're darn near everywhere, so I wouldn't ever have to watch other people fishing and think "Bummer there are no <whatever fish> near here.
2) They fight with spunk. With the appropriate gear they're quite a tussle.
3) They taste damn good.
Bonus reason: I catch bass, both LM and SM, on "accident" when fishing for bream, so maybe I could hook some of them to scratch the big fish itch and just long distance release them.