XDJ-XZ vs AZ: Your takes?

I am currently looking to upgrade to an aio system and would like to hear what the main differences are between the two.

I mainly play at clubs and bars but would like to have an aio in my arsenal if there ever was a need for backup equipment.

I would also like to hear if the premium for the AZ is worth it, as I intend on having this setup long term.

All input is greatly appreciated, thanks!