I do not have the experience of these lenses but have years of exp with EF 400 5.6 and would easily consider using it on my X-T5 with the Fringer. Sharper than most Fuji glass, exceptionally fast AF and gorgeous rendering. Great deals to be had as well.
Both! How is your comfort zone with getting close to strangers? How tight do you like the framing? I personally love the 40mm full frame perspective (27mm on Fuji crop) and believe it's a fantastic semi wide for street and environmental portraiture.