Ive used my iPad Pro to connect to all kinds of Windows desktops and servers from nearly every OS version Microsoft ever made and it works quickly and predictably just like the desktop version. RDP is a pretty well established protocol, and seems to have aged well. Even over LTE connections, Im able to maintain a good connection. Too much latency and I get reconnected no problem. Unless you are unfamiliar with running RDP on alternative ports and cant modify firewalls, why pay money for any other remote desktop solution?
oxyph about Windows App Mobile