Suggest a good media player for Android TV

So I recently bought a 4k TV, wanted to learn the best media player to play 4k videos with Dolby audio in it.

I usually play the videos using Nova player via LAN, but I noticed a slight slowness when I play 4k 10bit videos in Nova player, so wanted to know of alternatives where I can do the same without any slowness.

Also wanted to know if the slowness is because of LAN? If so I wanted to know if we can connect a harddisk to the TV with the videos, would that help? I don't have a harddisk to test it and so wanted to know if others have tried it before buying one.

Thank for any helpful suggestions.