The FOSS crowd will eventually pop in and try sway you strongly the other way, but at the end of the day, it really boils down to bigger platform, more app choices and more supported platforms. If you expect anyone other than yourself to be using it, on anywhere else other than your own equipments, but just don’t quite know who or where yet, then Plex might give you a better running chance in supporting that use case. Otherwise, choose whichever one floats your boat more.