Of the major three(brook, brown, rainbow) brown trout are the most tolerant of warmer lower DO conditions, but not substantially. However, they are the most aggressive, cannibalistic and many think hardest to catch. Brook trout require the best water quality of the major three. Rainbow trout are generally the most commonly stocked trout for ponds. They have an golden morph which most of us who grew up fishing for trout in PA know them as palomino trout. So you can stick with just rainbows but have "two" types of trout in your pond for variety. Tiger trout can be tough to source but are an aggressive fast growing option that I think are very pretty.
