Canon SL2 or T7i
If you're not hung up on 4k, the Canon SL2 & T7i have the new AF Dual Pixel focus for video, which gives them then a distinct advantage for video. The Nikons in the same price range will have slightly better still photos. The T7i is a better option for stills over the SL2.
The T7i is a good camera.
Canon also has a wide variety of lenses at pretty competitive prices and Tamron and Sigma both make nice lenses for Canon.
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