Yes, it's a family heirloom from the Sage of Six Paths but so is Kurama. The Sage created the Bijuus out of the Juubi and all of the Bijuus saw the Sage as a father figure. The Sage passed the sealing jutsu to become a Jinchuuriki down as well. The Bijuus are heirlooms of the Sage and just like how the Sage sealed the Juubi inside himself, Naruto has a Bijuu inside him. Both the Sharingan and Bijuus are tools that a ninja uses and it depends on how they use it that defines their strength. Sasuke did not crave power since birth, Itachi made him crave power by filling him with hatred.
And sasuke solo? Really? Is that why Taka helped him with Bee and A? Why Zetsu saved him from Mei? Why Obito saved him from Oonoki? Why Zetsu and Obito saved him from team 7? Why Itachi saved him from Kabuto more than once? Why Naruto and Minato Saved Sasuke when Sasuke and Naruto were going to be killed by Juubito? Sasuke had help like most ninjas.
Really? Then why was Orochimaru scared of what Naruto would become in the future when Naruto was only 13 and wanted to kill him?
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Kurama is Naruto's same as the Sharingan is Sasuke's, both were passed down from the Sage of Sic paths. Take Kurama and the Sharingan away and what do you get? Sasuke who can't use chidori variations effectively because he needs the Sharingan, can't read,predict or copy movements or jutsus so can't see the jutsu's weakness while Naruto have every thing up to SM and he can fuse with Ma and Pa toad to use Boiling oil (Wind+fire+oil), Dust cloud jutsu and Frog song. Yes there are ninjas who are skilled enough to see a jutsu's weakeness and strength like Minato but Sasuke relies on his Sharingan to much to train his basic eyes to do that.
How are they not comparable? The Sage passed both of them down. The Sage created the Bijuus from the Juubi and they saw the Sage as a father figure. The Sage passed down the sealing jutsu to become a Jinchuuriki as well. The Sage's older son got the Sage's eyes which was pass down to Sasuke and the younger son got the Sage's body which was passed down to Naruto. The Sage used his body to seal the Juubi and passed down the sealing jutsu so others can become Jinchuurikis as well. Both are passed down from the Sage so take one out then take them both out only seems fair since both are tools that the ninja uses and it depends on how they use that tool.