My wife is always asking me why I don't have a school of "colorful" fish, rather than five large Dats in my 350. IMO, both are nice, but I prefer fewer larger fish. I would have to make the following points which are relevant to me:
1. With a fish, the presence, persona and "ability to relate" (whatever that means with a fish) becomes more tangible (for me) as the fish becomes larger. When the Dats were small, they were "interesting", but now that they're big, they seem more like puppies. In fact, I think of my 350 more like a kennel than an aquarium. So, presumably, we are talking about the enhanced ability of a human to relate at a quasi-personal level to another life form...Size matters.
2. I find that there is an enhanced sense of pride in viewing my tank now that the fish are larger. I suppose this has something to do with the feeling that I have met a technical challenge and succeeded to the extent that the fish have thrived and grown. After all, mainitaining water chemistry, diet, etc., to support a group of aquatic life forms is more intellectually challenging than cleaning a litter box. A few weeks ago, my sister-in-law was over and was marvelling at the size of my largest ST. I have to admit that my feeling was one of pride.
Anyway, that's sort of where my self-reflection takes me on this issue.