RDP from a phone is useful
But it's a bit of a last resort thing. Better on a tablet but you're still constantly zooming to read stuff, etc
I like(d) MS's own RDp client until the latest update just slings out something like Error 0x4 and fails to connect to the Win7 Vbox headless I have running on the (Ubuntu) server at home... so switched to Afree RDP (from memory).
Might well try Parallels, though