This guide is not 100% up to date, I have not done endless myself in a long time, but it should be mostly accurate.
Personally I prefer DP over both HA and SW, but between HA and SW, for me it is for sure SW in proving grounds. It lines up much better with all the waves, does not matter if HA got 2 minutes CD if you need to use it once ever 3-4 minutes. Due to the nature of the damage in PGs aswell the healing taken increase from SW is extremely benefitial.