Well...you already listed you don't use half the features
And resolution...getting a bigger tablet > higher resolution...if your 1080p is a 22" or more it will be better workplace than 4k 16" (imagine your 1080p icons/buttons 4 times smaller...)
I would only consider the slower driver updates on Huion (which COULD cause problems, but afaik the model you posted is "older" so should of been patched out) and parallax (the PRO Wacom has VERY thin glass...every other tablet, even older Wacoms have a noticeable one).
Colours you can always calibrate and the tools for it cost less than the wireless keypad for Wacom lol....and you can re-use for monitor etc...so there is that.
Either way GL with your decision