Thanks for your enquiry and great to hear you're an existing Ruckus customer!
I can confirm that all Ruckus APs that have a '5' middle digit, are Wi-Fi6/802.11ax certified. Currently that is: R850, R750, R650, R550 and T750, with H550 and T350 models to come in the future.
The main differences to look at in comparison are:
i) The number of spatial streams per-radio
ii) The number of concurrent clients supported*
iii) Ethernet interface details
iv) PoE requirements
* This number isn't a suggestion of how many simultaneously connected and active devices to design for on a single AP. It is a performance indicator for deployments of highly mobile clients in a high-density envronment where clients will be quickly roaming to and from the same APs and can remain in the AP's association table to further enhance roaming performance.
E.g. The R750 and R650 look to be very similar APs; both with 4x4:4 capable 5GHz radios, both with 2.5Gbps multi-gig ethernet ports. However, on closer inspection you will see the R650 has 2x2:2 spatial streams on the 2.4GHz radio and simultaneous client support for upto 512 connected devices. Versus, on the R750, 4x4:4 on both radios and 1,024 connected clients.
To build on the fantastic performance you've experienced with th R700 APs, and of course depending on your budget; I'd recommend comparing the R750 and R650 to replace your current deployment.
PoE requirements of the higher specification APs need to be considered as the higher performing Wi-Fi6 APs require more PoE power to enable all hardware features (spatial streams, USB, second Ethernet ports, IoT radios, etc.). The R750 requires 22.34W for peak functionality, the R650 requires 21.59W. Whereas the R850 requires 31W for full functionality.
Also consider your controller device as older ZoneDirector controllers may not be able to support the latest firmware required to connect Wi-Fi 6/.11ax APs.
You can find your nearest Ruckus partner at the link below, who will be able to help you with the above decision and possibly be able to provide trial APs for you to test.https://extapps.commscope.com/howtobuy/RuckusChannelPartner?utm_source=ruckus&utm_medium=redirec...
I hope the above helps,