ASUS Xonar DG 5.1 or GA-Z77X-UD5H onboard sound card?

Im getting a new MOBO
i dont know whether i should buy the GA-Z77X-UD3H and use it with my asus sound card .... or just get the GA-Z77X-UD5H cuz several people said that its onboard sound card is pretty good

Thanks

DG's gonna be better than any onboard sound. Especially with high-quality headphones (built-in amp on the DG).

Another vote for the Xonar DG, it's really no comparison.

Check out this unboxing of it: