Trout is my favorite fish. I have cooked quite a few over the years. I usually cook whole trout which you can get from Cosco where I live.
Trout used to be readily available at local markets. I asked a butcher why you couldn't find it any longer and he said many people consider it to have a flavor that is too fishy.
With whole trout, you can stuff them with butter infused with things like garlic and lemon. There is a lot of fat in the skin so I don't have a problem with it drying out.
I cook it to 145F. After cooking, you can carefully filet the fish before serving, or just stick a whole fish on a plate. The skin can either be peeled off or eaten.
Another way to do whole trout is to stuff it with butter and wrap it in foil before putting it over coals.
You can do filets on a grill using your favorite rub. Blackened trout is good. It cooks like most other fish. I use a griddle to help keep in from falling apart when I turn it. Filets are pretty delicate.
Since trout is farmed, it should be low cost. Unfortunately, filets are often pretty pricey and small where I live. Learn how to deal with the whole fish and you will save a lot of money, plus you get the fat from the skin which helps in the cooking process.