Ok, let's see:

-Guts was raped and sold by his father.
-Gaara had a demon put inside him by his father, then abandoned because his father couldn't control him.

-Guts had to watch his girlfriend get raped and abused to the point that she's retarded.
-Gaara was betrayed by the only person he thought cared about him because his uncle blamed him for the death of his mother.

-Guts has a demonic force inside him because he can't handle his childhood issues.
-Gaara has a demonic force inside of him due to no fault of his own, and can't ever sleep for fear of the demon taking control of him forever.

So Gaara never got raped. Naruto magna isn't geared exclusively towards adults. I'd say those points go to Gaara, but that's just me.

Of course, more stuff has likely happened to Guts because he's the main protagonist, whereas Gaara isn't.

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