Am I the only one who thinks that at the GUI level Ubuntu is better than OS X? (I use Snow Leopard and Ubuntu 8.04 extensively)
Only reason I quit is that after speccing hardware that had OSS drivers (and was fairly underpowered to boot), drivers in Ubuntu still didn't work 100% (eg, connecting to external displays broke X render support) and this got worse over time (Intel drivers being replaced with much more unstable replacements).
I still develop for Ubuntu, but inside a VM.