I did a search just a few minutes ago and found no results that were useful to me. In fact this very thread didn't even come up using "XP MCE" as the search terms. I only found it using Google. The search terms HomerBoy linked to were helpful to me, as I'd been trying to find comparisons between the two versions and couldn't find anything useful, only "buy and compare" type sites mainly, and looking for the word "versus" hadn't occurred to me.
Now I know exactly what the differences are between the two version (which features aren't included from Pro, and which ones still are even though it's meant for the home). However what I'm really looking for is whether there's any performance differences between the two if you use it without the MCE functionality. Considering the price difference of 30 to 40 dollars buying the OEM versions, if MCE performs just as well, then why NOT get it? I've seen a few mentions of MCE even performing slightly better than XP, so I'm trying to get some details on that now. If on the other hand there are added features which can't easily be disabled which end up using CPU time or memory in MCE, then it comes down to whether the lower price is still worth it.
Heck, I just found this comment which pretty much answers the question of whether MCE should or shouldn't perform any worse:
"Interestingly, if you take your MCE CDs but type in an XP Pro CD key when it asks, it will never ask for the 2nd disc and you'll get a prefectly normal copy of XP Pro."