Ho-Oh is the clear winner in my eyes, just because it looks so different from most GX cards so far. I like variety, and I really hope that this era can have some sort of artistic variety with GX cards instead of just being all the same style. More things like Groudon/Kyogre/Rayquaza/Hoopa-EX from 2015 would be incredible. Any new aesthetic really. Hell, I kinda even miss Ryo Ueda's intense shading.
(I mean I really just want things to look as amazing as LEGEND cards but that's probably just a dream)