Mainly just initial opinions on the two when you use them both... Which do you like to use when you're just relaxing? Working? Etc..
I'd be interested in hearing the differences between them when you get a chance to post. I have an iPad Air and have only played around with the Surface Pro's. I really didn't pay much attention to the Surface 2.
I currently have a iPad 4, a Surface Pro (original) and a Surface RT. I also have windows phones and iPhones. I use a Homebuilt PC to control it all.
First off, build quality..
I find the surface pro, RT and iPad to all be about the same quality when judged purely on their hardware. I have to give the edge to the surface with its kickstand. When I'm using my iPad without a case I'm always very hesitant to just lay it down on the back and possibly scratch the case. With the built in kickstand, I just kick that out and set it down with no worries. Even doing that with the surface I have yet to see any wear or scratches on the corners. None of them creak or flex when a moderate amount of pressure is applied. The iPad (especially the Air) wins in the weight department.
Second, usability..
I'm more of a casual user I guess. I mostly use my tablets for music, videos, and (most of all) surfing the net. I like to use my iPad for reading eBooks much more because of the 4:3 ratio. Using the surface in a vertical orientation just looks and feels silly because of its 16:9 ratio. However, videos that would be letterboxed on the iPad are not on the surfaces so I do like those better for videos. I find all of the touch screens to be about the same in response with the iPad possibly holding a slight edge. I also prefer the iPad when looking at screen brightness.
Its no contest when it comes to battery life, the iPad wins hands down. The Surface RT comes close, but is always second best.
Honestly, I find the Microsoft ecosystem a diamond covered in a huge pile of crap. The potential for everything to work together and sync is there but its so messy that its almost not worth doing it. The potential of the Microsoft is what keeps me messing with it. Take Xbox Music. I signed up for the year long music pass last December and have struggled with it almost every day to try to get it to recognize my own music collection. It cant find matches for albums that have one little difference in the title like & instead of and. Sometimes it just randomly downloads songs and randomly matches things. But, when it works, its awesome to have all your own music available in the cloud to stream or download whenever you want. Xbox video is almost the same way. The ability to incorporate your own videos in a touch friendly format is great, but if you buy a movie you only get to download it 5 times. What??? I can download my media as much as I want with iTunes.
TLDR version'
The hardware is great on everything. Apple has the more mature and user friendly ecosystem. However Microsoft is working on some very cool stuff that could change everything in mobile if they can just get the damn details right.
PM me or ask any other questions and ill be happy to answer them.