It depend of the scheduler.
If using strict priority, 7 is higher and 0 lower.
If using WRR, every queues have same priority.
Note that QoS on Netonix is local only and won't affect other devices on your network. By exemple, if you connect a wireless radio that do 60~180 Mb/s to a netonix, it's useless to add QoS on the a gigabit port that will never be saturated since the bottle neck is the wireless radio connected to it.
I'm still hoping Netonix to add the possibility to rewrite PCP and DSCP value instead. That would be way more usefull for WISP. Eric already specified that the core switch could do it in this post.
https://forum.netonix.com/viewtopic.php?f=6&t=3328&p=23562&hilit=pcp#p23562