This is a personal choice. We cannot automatically recommend an upgrade without valid reasons, but it's always a good idea to be on a recent version if possible.
Is this a new deployment of the VX9000 and APs?
Did you already have other APs adopted by it?
Do you have enough licenses on the VX controller (default 64 AAP)?
Did you install the VX license?
If it's a new deployment, is there a reason you're not on the latest version of code?
Prior to the VX, how were the APs managed?
Christoph S.