I've not used the Surface 3 much, but I have one friend that really likes his. I personally hated the keyboard.
I don't know all your plans for the tablet, but I do have some experience with the
Asus T100TA
My daughter had back surgery during summer, and was limited to only carrying 5 pounds, and her school issues laptops, but they were too heavy, especially with books.
This little bugger is a tablet when you disconnect the screen, and netbook when connected. It runs full Windows, not the RT version.
Battery life is all day and comes with Office (not Outlook though).
It boots surprisingly quick, owing to the solid state main drive (don't get the 32 gig version)
With a baytrail intel 4 core cpu, it's not fast, but it's not slow either. Not as fast as a Surface though.
USB 3 built in, plus micro SD card built in. Micro HDMI out to plug into external monitors
Downside is cheap plasticy feel and build, but I got it for $325 at Amazon, so it's half a Surface pro, and has a much better keyboard.
I use it more and more now that my daughter has boys wrapped around her pinky carrying her books and laptop for her.
Recently, I was a conference speaker at an event in Chicago and did not want to carry my whole Dell Precision M6500, with 17" screen and weighs the same as an anchor, in the city and all over McCormick place. I took the little Asus and it worked like a charm, battery lasted the whole train ride from Detroit. I left the Dell in the basement at home with TeamViewer running, so I could connect to it and run it if I needed to.
They also make a slightly larger version the
T200TA