I would recommend waiting to see what

tablets are released in the future (after the Surface Pro). Right now the Windows 8 tablets are with the Atom processor. Once the Surface Pro is out the other vendors will probably release their Windows 8 tablets with the i5 or i3 processors.

As Bob says the RT will only run the windows store apps (Ipad only runs the Itunes apps and Android runs the Google Store (names Play store apps) (amazon does it a small Android store). I was looking at the same thing but decided to get a laptop with Windows 8 and an i3 processor that can run older apps and the new apps.

The RT does have some advantages over the Pro

Because of RT arm processor over (pro) intel
1. Longer battery life
2. More compact case
3. lighter