In our house, the Easter Bunny, hands down. Santa pretty much hits the store and buys whatever DS asked for and then picks out some things for the stocking (which "he" enjoys doing). It was always family tradition in my family that Santa didn't wrap our presents (made for better "WOW!" photos when we looked under the tree for the first time Christmas morning) so pretty much all Santa has to do is wait until DS is sound asleep and then hang up the stocking and arrange an unwrapped present or two.
The Easter Bunny, on the other hand, has to pick out the right combo of candy and toys (again, something "he" enjoys) and pick out a basket. Then "he" has to wait until DS is sound asleep and then go into motion finding a hiding place for the basket and stuffing the plastic eggs with money, jelly beans, M&M's, etc. Then EB #2 hides the eggs in places he didn't hide them last year, while EB#1 stuffs the basket artfully (even though DS rips through it so fast it doesn't matter). Then EB#2 scatters jelly beans in the JB trail to the basket. Then EB#1 has to neaten up the trail, because her father was ridiculously precise with the jbs when she was a kid and EB#2 just doesn't do it right and even though she knows she needs to relax about it, she is a tradition based little bunny.
I enjoy both holidays - Easter is nice but LOVE Christmas - but I have to say the EB has a more labor intense job in this family.