Every product has it's issues. My SP4 had issues at first, but now it's rock solid, no BSOD's, wakes up perfectly, no driver crashes, etc, I'll put up my SP4 against ANY iOS device out there for stability. The only issue left is I hope they tighten up battery life while sleeping. Otherwise I don't see the value of comparing lists, especially on something as subjective as individual experiences. One person may have a perfect device, while the other gets a dud. We just keep rehashing the same thing over and over again, myself included. Yeah I like the SP4 better, you like the IPP better, do we really need to repeat it a different way again?
It's besides my point though. Even if the SP4 was a piece of crap, I'd pick it over the IPP ANY day of the week due to the increased functionality. Once again this is how I use my device and I'm not trying to push it onto anyone. I just know that the day the very first modern windows tablet was released I ditched my ipad and never ever looked back.