The "best" 300MB file isn't about 4K HDR quality. It is about achieving a balance. Typically, these files are encoded using codec rather than the older x264. The HEVC codec can retain decent 480p or 720p resolution at half the bitrate. The "best" releases on DownloadHub4u usually offer:
: Most 300MB files include both the original language and a dubbed version (usually Hindi). downloadhub4u 300mb best