the sr307 can do only dd, dts... dd+ is touch n go.... but since u hv seen it doing, i suppose it can.
yr coming denon x4400h will open up a whole new world - 4k, hdr, atmos, dtsx, etc.
if yr tv is not 4k hdr, plan on it!

older box players can't do as much as current ones - video and audio.
video - hevc, 10 bit, 4k, 60fps, hdr, chroma 444.
audio - already mentioned.

i have not use a minix before, can't comment.
Q10pro is probably among the best media players at this time:
.. plays almost all video formats... in my experience, it can't do only one uncommon format - hi10P sometimes found in japanese anime.
.. audio.. anything.. dts, dts, dd+, dtshdma, ddtruehd, ddatmos, dtsx.
.. it has its own superior native video player in a media center app (simple, nothing fanciful).
.. plays dvd folders, 1080p/2160p bdmv folders with full menu's (this is hard to find on other boxes).
.. auto framerate switching - auto changes to right framerate when a video is played... 24, 25, 30, 50, 60 fps.
.. has an internal hdd compartment for sata 3.5" hdd.

in summary, if yr avr and tv can do it, q10pro offers u a wonderful playback experience - video and audio.
u will probably start recollecting yr stuff, junk the old ones... like i did.

i have used other boxes too... besides the video and audio capabilities, the diff is also seen in video and audio quality production and smoothness when playing.
cheap boxes tend to have judders, flashes, less colors, audio disconnects and even hang.

Sorry bro, no more stock for Q10 Pro. We don’t plan to restock at the moment due to the model nearly three years.