What has the most application support?
x86 architecture ftw.
For the sake of argument, though, here's some Google search results:
"windows applications" 302 million hits
"linux applications" 18.1 million hits
"mac applications" 21.6 million hits
"vista applications" 52.6 million hits
"leopard applications" 5.3 million hits
"unix applications" 2.4 million hits
"xp applications" 3.3 million hits
"red hat applications" 13.1 million hits
"debian applications" 8.2 million hits
These extremely basic and misleading results may indicate that maybe there actually are more Windows applications than Linux or Mac applications. But so what? Even if there really are 5,300,000 Leopard applications available, I only need like 70 of them. Anything else is, in a way, overkill.