Advantages? Same?
no

paladins have very few advantages

higher damage weapon, higher deadly strike
faster block rate, and easier to have Eth

sins depends on c/s - c/c
but besides uninterruptable they dont have anything over drus/dins

drus have more life /dmg (ed%)/fhr then both though.

drunk yes. you can max both if u want to put a few less into one spirit, and maybe no summons/shockwave.
and then pump both shifts, and only use one spirit its mostly interchangeable.