Yep, it also depends on your time availability...
I can work out 4 times a week, sometimes 5, if I do one muscle a day I may end up leaving one out every week, no good in that now is there?
I have done several different workouts, the Bi / Back and Tri / Chest, opposites like Chest / Back, negative workouts and a plethora of things; so far the ones I've liked the most have been the 5x5 and currently DC training. I have never gained more strength and size as I have in the 2 months I've been doing DC training, have also set several new PR.
But it will take figuring out which one you can adapt best to.