depend on the target and how you train.

i currently doing bro split. monday leg (hardest day.) , tuesday chest , wednesday i do arm and abs and some cardio ( mid intensity only) , thursday back workout , friday shoulder.

full body is more for ppl that has less time to go gym maybe 1-2 times a week then surely a fullbody will be great.

or if you wan just go for push , pull , leg and repeat.

ofcourse when to rest is up to you and how you feel.

most important is high protein diet.