Upgrade AP One AC Mini to HW2?

I have two AP One AC HW1 Minis conneced to a Pepwave Surf SOHO HW2 running firmware 8.1.3. I’m considering replacing the minis with HW2s. Are there any benefits? Is the HW2 unit faster than the HW1? Are there any issues connecting the newer mini model to the older SOHO?