upper/lower is good. I am doing full body at the moment 3 x a week for a while. More reps too. I will go back to my normal split later though, Chest/Back-shoulders arms-legs, training only 3 Days but of course more volume. I actually like training 3 days a week and people often think full body is just for beginners but if you train with intent then it is hard with basic moves. High rep squats yesterday got me sweating...Full body or Upper lower i enjoy the most. Stronglifts, PHAT & lyle Mcdonalds generic bulking routine are the best ones i've tried so far.
Not done anything for a few years so gonna do a full body 3 times a week for a few weeks then its gonna be a 5 day split
Legs
Chest
Back
Shoulders
Arms
5 or 6 exercises, 4 or 5 sets 10 ish rep range perfect reps .