I think the VP4 is the decidedly better pedal. Like not even close. Beyond having 2,743 good emulations of all the classic pedals and effect types, to me what FAS nails on reverbs and building the more exotic delay/verb tones, for my tastes, is sounding like open natural spaces. You can go full Elronds Quartet but it still sits in a very pleasant way in your ear.
The H90 is a badass pedal, (Brace for impact) but kind of excels at different things. The pitch block is awesome, they’ve created the perfect anti-shimmer, and the reverse algos are great. You have to guard against the digital sheen with the pitch type stuff though. The “regular” effects are good in isolation, but I havent turned to it for that stuff much, in my relatively short time with it. It’s the “unnatural” stuff thats amazing. There is a preset in there that is combining the wormhole and Blackhole reverbs or some combo the two, and it sounds like two massive reverbs collapsing back into itself. Played at volume in stereo, its jaw dropping. That sort of stuff isn’t going to help anyone doing James Brown covers at the local coffee shop though.

But it’s those sorts of tones that have caught my attention thus far.
Eventide gets major points for having a Bluetooth tablet app, but it kind of needs it because it’s much more of a pain in the ass to use on-device. VP4 device editing is much easier. (But, dear Cliff, please release a tablet editor like Eventide did with H90 Control)