Dealer vs. garage: what's the dealio?

Like the others, mostly cost but I’ve had good and bad luck with both. If it is a possible recall issue though, I’d be inclined to go to the dealer. They have a better knowledge of the particular type of car, have seen it before, have specific training, tools, and support. For a newer car, or complicated issues, I go to the dealer. For most others a regular garage. I’d have to have a lot of confidence in a regular garage to let them tear an engine down.