Very rare, but lens is WR and Red Badge so it should not happen with brand new lens. Maybe i'll try send it to Fuji service center. I had similar problem with new x-h2s which had a smudge visible on photos even on very wide apertures and send it to fuji becasue blowing and cleaning by swabs not helped. They change filter on the sensor under warranty and now everything is ok.
Have you had each in hand? Size of camera body, couples with your hands might make or break which one you go with. Personally I cannot use an X-TXX model far too small. Then there is balance considerations depending on what lenses you'll be using, certain models are a better match than others on smaller or larger bodies.