Best external player for FIRE TV 4k MAX

which is the best? i don’t have Dolby vision Tv support, but i don want black or gray screen using DV profile 7 i’m using VIMU but sometimes don’t track the progress, also i use a 5.1 Digital Plus Audio system.

so i really want to play any file without problems, stuttering, or black screens

also my internet connection is 800mbps but in the stick i’m getting 200mbs

or if exist tv stick or tv box that don’t have no one problem with Dolby Vision or Atmos, please tell me which one