[Discuss-gnuradio] Difference between USRP RIO and Ettus USRP X310

I am planning to test some of my physical layer algorithms on SDR.
I compared these two USRPs , though Ettus is part of NI now and features of these devices are almost same, still there is huge variation almost double in price which I am not able to justify!

What are additional benfits of NI USRP RIO over X310?




Jay