Something DC-ish. Like a 2-way split done 1.5-2 times a week. If it's pure size you're after I recommend HST, but it can be hard for people to swallow.
I´m really not looking to gain massive amounts of size... rather defining what I have, or maintaning - except for my biceps and triceps, those could be bigger lol
As for DC training, Ireally needed to study their principles and so on, so I could design a good workout program for me... is it ok if I stick to the regular 3x 8-12 rep range on exercises? I´m a bit confused though, because you said we should only do 3 sets for each bodypart in a given day, and would get me doping just one exercise for that bodypart?? For example, on biceps day, I wouldn´t be able to do barbell curls all the time, because you should be changing it up, right? Would that be productive, anyways?
As for the 2-day slpit, what bodyparts do you recommend on each day? Also bearing in mind I do HIIT every other day, would the legs be overtrained? I´m doing low intensity cardio the after leg workout, hope I´m doing well!

thanx for reading