I have the 12.9 pro and a mini 4, I have multiple email accounts etc on the pro but just my iCloud personal account on the mini as I use it for reading and don't want to be distracted by work stuff. Bought a moleskine case for the pro as the Apple silicone case and cover are too flimsy and I had managed to slightly bend the pro at the bottom although it was easily straightened again I bought a more sturdy case.