Nails like humans and apes have seem pretty weak compared to claws, and even other tree-dwelling species have hooked claws.
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Quite many things.
1) nails helps to grab very small things. You cannot do it without nails or barely possible with claws.
2) nails create even carcass which adds supoort beyond fingers bones. That further improve grabbing. Claws makes it harder. That also helps to feel object shape.
3) nails are soft. At any point you can easly bite part off uf they start to makes troubles. Claws are very hard.
4) finger with nails are capable to climb almost on any natural surface, while claws are very efficient on trees and burden on tough surfaces.
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