@methesinner since you can be fresher and have less sets to do, the OVERALL QUALITY of training is higher.
lets say you have 12 sets of chest sets spread out over 3 days, that's 4 sets each day.
if you spread that over 4 days, that's 3 sets. the 3 sets quality especially on the last set is better than the 4.
overall, higher frequency of training (volume equated) is almost always better than lower.
better for time. better for quality of sets and reps. better for fatigue.
basically im telling you to up it if you can.
hell if you have 6 exercises to do 3 days a week, you can do "3 exercises a day for 6 times a week"
with 3 exercises, you can invest more out of every set for those.