I'm reading this on one of my macs right now. I haven't gone to leopard yet, because tiger ain't broken. In the other room is my ancient titanium powerbook—it has been on since the summer of 2001, and the only restarts have been official OS upgrades that require a restart. Not bad to have an uptime measured in years.
My SH4 machine is a PC, though I've thought about bootcamp, just never got around to trying it. I have to say, I prefer my macs to use, but I'm equally comfortable with my XP Pro machine (I've had gaming PCs for years, and I work with them at times as well), though it's certainly more finicky.
Now that the OSes both use the same hardware, it really is mostly a preference issue. I read a recent article that said a macbook running vista beat the other vista laptops. Say what you like, they make really nice hardware. Pop the hood on a mac tower some time and look inside. I tried to do a good job on the E6600 I just built this spring, but man, gotta love the look of something that can be built for specific hardware, not a generic box to take a wide array of PSUs, mobos, etc. It's sorta like our new car. If the 335xic bmw had to have a generic engine compartment to take 80% of all engines available the car would look rather different under the hood
Good luck with it, though.
tater