AMD's as far as I can tell, from experience, tend to run hotter, & use a little more energy. Despite the extra heat, after years of using AMD chips, I've never had any instability issues, even with my severely overclocked Athlon XP 3000+. (I did kill a motherboard in the Texas heat once, but no problems with the CPU).
I run an AMD Athlon 64 in an off-brand notebook, and that may account for some of the heat. My friend has his Athlon 64 in an HP, and it runs cooler (the HP has better airflow than my off-brand machine). And another friend of mine is running an AMD Turion 64 that runs cooler and
gets better battery life than mine.
Anyway, on the upside, I believe AMD 64 chips handle RAM access with greater dexterity than the Intel chips, and provide higher FSB speeds. Dollar for dollar
, at least, I think AMD usually outperforms Intel, though, if money is no object, top-dollar Intel systems might make for a different story.Whatever you do, if you buy a notebook with an AMD chip, make sure to install AMD's chipset drivers from www.amd.com. In my experience, the chipset drivers that come with most notebooks restrict processor performance. The AMD driver does a better job controlling the processor.
AMD's will cost a little less than Intel computers, usually. You'll get a lot of power, plus 64-bit processing, making it relatively future-proof. Of course, AMD is coming out with its own dual-core setups, now...
As for 64-bit operating systems, I haven't tried a Vista beta, but I did try 64-bit XP Pro & the machine really flew. I can't wait to install a 64-bit OS. I did not buy 64-bit XP Pro, though. I didn't have any trouble finding drivers for my hardware, but some (32-bit) programs didn't run all that well. Could've been an issue with my (shared) GPU though.