OM-D E-M1X

There's very little difference in AF performance between all IMX27X based cameras (that's E-M5 III, OM-5, OM-5 II, E-M1 II, E-M1 III and E-M1X). The E-M1X is the only one with unique processing dedicated to subject detection but with only 121 AF points it is still primitive compared to modern camera

They’re mostly all the same. Just get whichever one you want and stick with it forever. I’d probably avoid the cheapest Canons and cheapest Sony’s. The Nikon 50-250mm is a very good lens considering what it is. They also have a cheap but also very good 12-28mm The cheapest Canons like the R100 nerf

The answer to that question isn't quite as easy as one might think. The OM-1 would likely be the right answer for many people, but it depends on how you do your macro. If want to do a lot of single shot images of less-than-cooperative insects, the OM-1 has a leg up. Its AF system is generally faster

I made the switch, twice..., and I think I'm going back. went from Canon 1000D, 7D2 and lastly 1DX2 to Olympus OM-D E-M1X, didn't liked the low light performance and switched to Nikon D850 which I never got the hang of despite the very impressive IQ. Now I'm at a OM-1 which is really really good but