Based on link pick:
I think Naruto's past is zaidi tragic because he didn't get too see his parents and knowing that the Kyuubi inside him killing his parents and the whole village makes it even worse.

-anyway it took me a lot of decision to choose between Naruto and sasuke, honestly sasuke is really sad too because sasuke's family got murdered kwa his OWN brother and also he was betrayed kwa his own brother and his way of losing his family members was very tragic. Sasuke was also tortured kwa Itachi's mangekyou sharingan and he got to see how Itachi killed his own parents and im not saying that is very sad, that is really sad Indeed. However, now i want to talk about Naruto's past. Naruto past was even zaidi tragic because he didn't even get to SEE his parents and when he found out the truth about him being the host Kyuubi's body it became even sadder because the Kyuubi was actually the one who killed almost an entire village including his parents, he also didn't have any friends. Let's just point out the factors both positive and negative:

Naruto's Past (negative):
-He became the host body's Kyuubi.
-He didn't even KNOW his parents.
-He didn't have anyone to upendo in his past not even Marafiki au family.
-Everybody hated him.

Naruto's Past (positive)
-His father gave him a chance to live

Sasuke's Past (negative):
-He was betrayed kwa his own brother.
-His family was killed kwa his OWN brother.
-He saw his own parent's death.

Sasuke's Past (positive)
-He at least know his family and lived with them.
-He at least got some upendo from his brother before he know that he got betrayed.
-He was a great ninja.
-He knew that later on his brother didn't actually betray him.

**Imagine wewe are Naruto:
wewe never knew your parents and wewe had to be alone for 12 years. wewe knew that A monster was living inside your body and what if wewe also knew that the monster inside wewe was the monster that killed your parents and almost an entire village that led to people surrounding wewe hating wewe and feels negative when being around you. Since people hated you, wewe became stubborn and became naughty and people hate wewe even zaidi but the good side is wewe try to achieve a high goal and wewe try to never give up. Even if people hate you, wewe still try to warm up to them and they will like wewe better.

-If wewe were Sasuke, of course wewe would also be very sad because wewe saw your parents death in the hands of your brother but also wewe can at least try to stop your hatred from growing inside you. wewe also are a great ninja and some people still like wewe and people don't ignore you.
(though the bad thing is sakura likes wewe if wewe are sasuke. why its bad i say? because Sakura is a b!tch!!! wewe are also emo if wewe are Sasuke.)

So its what i think anyway, and please dont be offended because this is just an opinion about what i think. oh- and one zaidi thing, please remember to rate^^