niner air 9 29er frame (430$)

or

Sette Razzo SC 29er Carbon Hardtail Frame (600$)

looking for a decent and affordable 29er frame to build my bike accordingly..... which among the above mentioned bikes should i go for?

appreciate any recommendation and in addition if you are aware of any relevant offer that is close to my budget (29er frame) i also appreciate listing it here.

PS: I don;t mind a used bike frame.