Sony, just look at how they smash everyone on dxo, half of the top 30 lenses are sony, and the other half are zeiss.
Best video: Sony, hence why the Japanese use them on the iss and the BBC use them for their nature documentaries
Best landscapes: Sony, landscapes are very dependent on good glass, no one else has come close to something like sonys 24mm f1.4 and the a7riii has hands down the best sensor for landscape with its class leading dynamic range.
Cheapest ff: sony, there's 2nd hand a7's for well under $500
Best performance for the size: Sony, they have the smallest ff bodies by a mile, and if you need properly small and still at least a good performing crop sensor, the nex 3 is tiny.>best sports/wildlife
No competition, no one else has the lenses or AF ability. >poor hipster
Sony, as i said, cheap cheap a7's, with their triple dials, sleek and chic aesthetic and great matching with legacy lenses, this is the obvious hipster choice>middle income hipster
Sony, same as above, but with an a7iii and better legacy lenses>rich hipster
Sony a9 and manual focus zeiss lenses