I love the Push Pull legs routine 3 on 1 off like this
Day 1: Chest/triceps/shoulders
Day 2: Back/biceps/traps
Day 3: legs/abs
Day 4: OFF
Day 5: Chest/triceps/shoulders
Day 6: Back/biceps/traps
Day 7: Legs/abs
Also I'm follow 3x5-8 on compounds and 3x10-12 on isolations, do you think this is optimal? :)
I've always liked 3 on 1 off, but recently i've liked squatting 2-3x a week and benching 2-3x using daily undulating periodization the most.
As for your rep/set ranges, they're fine. In reality for a basic - higher level intermediate lifter just about any program is going to work as long as you put the work in. Do 1-4 reps sometimes or 12-20 reps, after a while you'll find the rep ranges you like most on certain exercises depending on what your goal for the workout is.
I am currently doing
Day 1) abs, chest, triceps, rear Delts, biceps.
Day 2) abs, quads, hams, calves, lower back
Day 3) off
Day 4) abs, shoulders, traps, triceps, biceps
Day 5) abs, lower back, upper back
Lower reps for compound movements and higher reps for single joint exercises.
I love doing one body part per day, allows me to go all out on that muscle without thinking of what comes next.
Something like:
Day 1: Chest
Day 2: Back
Day 3: Legs
Day 4: Shoulders
Day 5: Arms
Exception is calves that im doing them 3 times per week in an atempt to grow, always in beggining of session.
Rest days I include as needed.
45-60 minutes sessions, including the warmup that can take up to 15 minutes (its winter grrr)
I do one body part a day. I do cardio and abs every other day on top of my workout. I only take a rest day when my body tells me it needs it.