It seems to me that Git's ecosystem is rather more developed than Subversion's, despite its younger age. I haven't seen any hosting service for Subversion repositories that approaches GitHub (and even `gitweb` is pretty nice actually) and the amount of stuff in e.g. http://git.or.cz/gitwiki/InterfacesFrontendsAndTools is pretty huge compared to what I've seen for SVN.
When it comes to documentation, not only is the reference manual excellent in the usual way of Unix reference manuals, but I also know of six tutorial Git books, several of which are free online: the Git User's Manual, the Git Community Book, Git Magic, Pragmatic Version Control Using Git, Pro Git, and Git Internals.
As I said in another comment (now deleted), I'm using Subversion on a project for the first time in years, and I constantly find myself wishing the project was using Git.