To do what on it, they're quite different beasts.
Atom long battery life but not very powerful
Pro half the battery life of an atoms but i5 power.
Depends what you are doing, if its very light work and webrowsing and you don't need power then atom is better due to battery life and weight. If you need processing power then your only option is surface pro and other I-core based tablets.
Edit - oops thought this was pro thread.
In which case it comes down to, do you want traditional desktop applications or not and price. Battery life is the same. I think the acer w510 is an absolutely cracking device, apart from the small screen size, but that maybe what lots of people want.
Id love a pro but cant justify the bulk or extra cash. Its more on the speed of general use. An atom running x86 programs is a bonus but it wont be heavily used. My sway to the rt has purely been down to build quality over atom tabs
Meant to post in this, but has anyone had funny fading volume levels playing back vids since the last update?
During quiet moment during playback it seems to nearly cut off the sound and if a louder bit starts it picks up the volume again, very annoying.
The biggest flaw is not being able to (easily) set the SDXC card as library locations. I've used the hardlink workaround, but this really should be a built in feature for the Surface and indeed Windows.