Farm raised can be great, even larger fish. Depends on the feed and how fast they're grown. You can raise trout to have that light pink and firm, flakey texture.Store bought vs. wild caught makes a waaaay bigger difference in quality than size or age. I doubt you'd notice a difference due to size alone unless you eat trout regularly. I think the further north you go (colder) the better the quality of fish too. Same with venison. On the east end of NY there are small wineries all over the place. I had a buddy with a nuisance permit that used to hunt the deer on the wineries and I swear, that was the best tasting venison on earth. The venison down here in the south tastes like crap.
Whatever they feed those farm raised fish definitely screws with the flavor. Diet matters. A lot.