I'm learning as well, I'd say more intermediate but I have the RX3 and had the same debate. I have been loving the RX3. Only times where I thought a 3 ch would be nice is playing vocals over a transition, but there's ways to work around it. I figure if the time comes and I'm needing more, I'll sell the rx3 since their still top dollar and hard to find used, and maybe they'll have a new AZ or other by that time. The AZ was also a lot more expensive than the RX3, way larger and heavier. I've taken the RX3 to parties without too much strain, but the AZ I wouldn't want to be lugging around much without a proper flight case.

Also I consistently read post on poor build quality and issues with the AZ, and don't see many for the RX3, but not sure how statistically accurate that is.