With NVIDIA GTX 1070's; is X17 worth mining?
Yes.
Are there particular algorithms that are better for NVIDIA cards?
Yes.
Please advise?
You should benchmark your exact card(s), as there are variations between manufacturers (eVGA vs. MSI vs. ASUS, etc.), and over/under-clock as appropriate.
Thanks. I did benchmark, they're all EVGA cards. I'm just wondering overall which algorithms are typically better for Nvidia?