fillet is the most tender but doesnt have the most flavor.
ribeye has a lot of flavor but yes does have some fat, but that is what adds flavor, its hard to judge if a ribeye is going to be fatty until you cut it into steaks. Most of the places i worked were cut to order so if you were a good paying customer or a friend, or a tipper, You got a better cut.
I like porterhouse myself, but its just a variation of the T-bone
I was a meat cutter, and during that time I also worked as a grill cook in various resturants for about 8. Its always ben a second job for me, since my "big time high pay computer job" doesnt pay enough.