I see what you're saying friend, but i would be very cautious about MS,
well, I have been using Windows 7 release candidate for a while now, and you are right about one thing, it is as stable as XP was. wanna know why? because it is Windows XP with a new skin, it sure kicks Vista's $%^^, but it is basically XP. same functionality, same need for drivers, same strange disappearing of hard drive space over time and same slowing down in operation over time. All of these issues were strange in every windows release and they continue to be so...
you can download it free and try it for yourself !
Apple are no saints either, and sure there Logic release isn't exactly anything to write home about, and they know it to cause they haven't been pushing it marketing wise as they have done in the past, but one thing I know that is good enough for me. Every time I turn on my mac it behaves exactly as I left last time, if there were bugs they are there and I can usually figure them out and avoid their causes. In short, the system is far more predictable than windows, and a predictable system the most important thing for me as a composer.
good luck to you
David