None really SCH has better shields WHM has better heals
DPS is pretty much the same
The best I can tell you as a SGE main
you get everything maybe not the best but everything and if your a Vet healer you make the best out of this
SGE isn't hard to pick up but can be challenging to get use to since it plays a bit differently
But once you start to figure it all out you feel big brain and healer is never stale when your a sage
Truly SE can be magicians when they want to cause you can feel like a dps when you crit a Dosis
Your mobility can make you feel like a gundam or magic girl whatever your fantasy is (though two would be epic)
When I say it feels like magic sometimes it truly does
But Numbers wise nothing think of it as a shoe if it fits you play it or not