If I want my transaction to go through ASAP, should I edit the max priority fee, the max total fee, or both?

If I am trying to buy something very quickly, I need the transaction to go through ASAP. Previously, I would just set the gwei to 50 above whatever rapid was on gasnow and call it a day. What do I do with the new advanced settings? Do I edit the max priority fee, the max total fee, or both?