I keep going back and forth... Now I am leaning towards the Galaxy Tab S - as spec wise is right on par maybe even slightly better than TF701. A little more up to date and since it seems Asus is not planning on refreshing the TF701 then a bit worried about RMA and support.
Also the Tab S getting Lollipop vs. TF701 nobody knows is making me lean that way as well.
I'm in the exact same boat as you, deerhunter.
I LOVE my tf700 running omni 5.1.1 (thanks to sbdags and company) but android seems to want to phone home so badly that everything slows down on this aging device's older 2.4ghz hardware. I've tried holding other premium slabs but i've become accustomed to the transformer way.
I like to play emulators so x86 is off my radar for now which is why I've had to steer clear of ASUS for the past year or so. Not only is the galaxy tab s tempting in the modern hardware, it appears they are going the way of 4:3 with all of their new slabs so this is the last chance for a while at premium 16:10 slabs from sammy. My main desire is to get better (than my tf700) wifi performance and memory architecture. Samsung wins in these 2 departments... but DAMN if I can't live without the stay power of the extra battery, the convenience of the full size usb port and the full size sd card reader! I just want it ALL! If only samsung had any interest in making a 2 in 1... holy schism that would blow my brain!
i will say, unlike asus zen ui, i actually care about some of the functionality built into samsung's android. the split screen is nice on the massive 2560x 1600 display, something i would actually use for quick copy/paste if it had a kb dock. also the floating video window is nice. I would miss that if I had to eventually flash custom "m" or beyond.
I would not say the 2 are nearly equal in spec. The Exynos in the tab s is much more modern, and the radio is 802.11ac. While the tf701 CAN run desktop gl, nothing seems to take advantage of it except nvidia software and old thd games. I wish snapseed or adobe cc would use the cuda cores just sitting there waiting to be used. The power in the Exynos may only be web gl, but it's web gl that virtually every (android) developer will actually put to the test.