I have a friend who does AV installations and he A/B switched in his house between Auro upmixing vs Dolby upmixing on 2 channel music content. I consistently preferred the Auromatic upmixer. Unfortunately, my current receiver doesn't have Aur. I am hoping to pick up a prepro with Auro sometime soon.
It looks to me like Auro has a decent amount of content as far as movies go.
https://www.auro-3d.com/consumer/
Guys who say Auro has no content (needs to be avoided) appear to be either talking out the wazoo
or maybe Dolbypays them more money. In either case, i don't think it is a good idea for Dolby to be a monopoly. Hopefully, DTS and Auro will pick up more steam with amount of content released.