MS Claims Windows 7 More Stable Than Mac OS X?

Reader BertJ just left a comment on my post "Microsoft Copied Mac OS X?":

Wait. 7 has registry and it's more stable than FreeBSD with the mach kernel? What am I missing? I just rebooted my Mac Mini that had 21 days of uptime b/c I upgraded to 10.6.2.

I'm with you on this Bert.