I recently bought the SKF, having tested both at the Apple Store. For my usage, the SKF is the way to go. I’ve never used a keyboard with an iPad since I got the very first one, but I’ve seen how useful it actually can be.
I use my iPad as a media consumption device mainly, but also writes on forums like MR and started getting tired of the on screen keyboard. Finding the SKF perfectly ok, and I mainly use my iPad without any case - using the SKF when I need to type something, and as a general case for protection in my bag.
It’s a good product really, I only have one wish - backlit keys. I’m a touch typist, but writing at night in bed, it does help with some lighting. I have the brightness on my screen all the way down not to disturb my wife too, so I can’t see any of the keys.
If I used my iPad more as a laptop replacement, well then I’d take the MK and a 12,9 IPP instead of the 11 IPP I use now.