Casua1

I don’t believe the XR500 has adblocker but both have geo filter. 
it boils down to hardware, the XR500 is higher priced due to its hardware and WiFi capacities, faster processors, better WiFi coverage, beamforming, throughput and so on. 
The R2 is a replacement for the R1, priced to be competitive and is Netdumas own router. While it’s WiFi might not match those of the XR500 if your router that you use now has good WiFi and is able to be put in Access mode you could use that instead of the R2 WiFi.
It just boils down to what you want and what devices you have to your network requirements.