>>4319712I still use my a6000 with 16-50 kit lens and Sigma 30 1.4 dc dn since I wanted a small, lightweight setup so I replaced my nikon D80 which is showing lens connection error since I dropped it. you can also get low cost chink lenses (tt artisans, 7artisans, viltrox) with AF or manual only aside from sony, sigma lenses. a6000 has crude face/eye detect but somehow works, focus peaking (outlines showing where it's focused), tilt screen, EVF, 1080p video
d5600 seems to have a more rugged body, a bit better sensor than a6000, traditional OVF, articulating screen, 1080p video, longer battery life. old nikon D lenses wont have AF since the d5600 has no built in lens motor so you'll settle for g lenses like 35 or 50 1.8g as the least expensive nikon prime lenses. you may also use third party AF lenses like sigma, tamron, or some chink brand lens, all with built in motor but there maybe issues with AF so research first. the whole setup may also be a bit heavier and bigger.
nikon d3200 has the same sensor tech as a6000.
samsung nx and canon m are dead mounts. samsung killed their dedicated cameras in favor of putting the focus on their mobile devices. canon killed the m mount and went r mount.
so it would be a6000 vs d5600. or maybe buy a used a6400 or a6100 if you can, just check the shutter count/actuation number the camera has (the lower the better).
nikon has also moved to mirroless z mount now.