For mass/size I'd say hop on an 8 week cycle of some test and deca and bust ass for the next 5 years of your life.
Honestly any sort of bodypart split would work for size or hypertrophy training. Moderate to high reps for isolation movements mixed in with some heavy compounds (squat, deadlift, bench.
Like I said initially, diet is key, regardless of the goal (size, strength, or conditioning).