Personally i think naruto had as bad or worse a life than kabuto...the only difference is that naruto was able to remain possitive, and through that possitiveness managed to work his way out of suffering
Naruto only had a bad life because others treated him like a monster, that was only until he joined team 7.
Naruto had friends, had people that thought of his well being, people that acknowledged his existence and his significance.
He was trained under a great master and was made a top priority by the village. Naruto lived in a much safer environment and was never forced to kill anyone and then witness horrible experiments on tormented victims.
I don't think Naruto had it as bad.