The 55-200 zoom ring has a 100mm mark... try it out for a full day shooting and see if you like the FL.... close enough to 90mm.
I used this lens (55-200) throughout its range... often landing at 100mm at wide open (which I believe was f3.8.)
The 55-200 is an all around great lens.
Is the 90mm sharper... probably. It's definitely faster and "sexier" sitting on an inventory list.
If I still lived in wilderness I might have the 90mm Fuji (135mm equiv).
It would make sense having a dedicated lens with greater reach to combo up with a 50mm equiv.
As it is living a semi-urban/urban life... it's not the focal length I would use often enough to carry it.
The flexibility and Image Stabilization of the 55-200 is a more useful piece.
Fact is it would be more useful in that rural life as well
The f2/90mm was a strange choice for Fuji to make in a "normal" focus barrel.... especially with the 80 macro coming out on its heals.
Fuji should probably have just done the macro in this Fl.