If I can fillet it, I'll keep it. If it's too small to fillet (or use for bait), it goes back. I don't often keep fish. A good day of fishing should end with the ride home, not cleaning a bunch of fish . I'm old, hot, and tired!

Bream, for the most part, I'll release (unless I need fish in the freezer).

Fish you didn't ask about....
catfish, probably 2-5 pounds.
bass, at least 12 inches.
sand bass (white bass), anything worth filleting. Same for stripers and hybrids (as long as they're legal length, of course).
crappie, I never measured, but again, something worth filleting.

People who won't keep bass, but will keep large bluegills, I'm lost. If bass are the holy grail, shad and bluegill are a major part of their diet. Large bluegills make smaller bluegills (that bass can eat). Large bluegill don't have a lot of natural predators (can't fit in the mouth of a bass, despite the bass trying). Humans are the big bluegills' main predator. I hate seeing pictures of the same cooler full of bluegills day after day (meaning the same people pulling out a ton of bluegills over and over again). Fortunately, they're prolific breeders, but I believe they can be over-harvested. But the people who do that also keep EVERYTHING they catch, limits be damned. In other words, I'm not complaining about y'all, just them .

In short, I prefer to do as little work as possible during the cleaning stage. I'd rather fillet 5 bigger fish than clean 20+ bluegill.