So what do you use your Surface 2 for since you still use it?? And why do you think that your Surface 2 that has the dead RT OS is more "Pro" then your 12.9 inch iPad Pro in many ways/respects??
I am really really curious!!
The Surface 2 comes preloaded with a permanent license of MS Office. MS Office for Windows RT is nearly as fully functional as MS Office for Windows... But Office RT does not include VBA support in Excel.
It offers full support of USB devices and peripherals... mice, keyboards, thumbdrives, harddrives, CD/DVD drives, presentation remote controls, microphones, videocams, printers, etc.
It offers near full support for wireless/network printers.
It has true and full support for dual display. The external display can be driven at it's native resolution.
It supports removable media (microSD).
In many business professional settings that I find myself in, the Surface 2 can handle 98% of the scenarios that a traditional Windows notebook can do. The iPad Pro doesn't come close.
I know that there will be people who will claim that all of those things are possible with the iPad Pro. That is not exactly true. Even if we consider convoluted work-arounds as "equal" to more direct approaches, there are still many of these things that are simply not possible with the iPad Pro.