All git operations are several times faster than their SVN counterparts, and git is more storage efficient as well. This becomes especially relevant for larger repositories.
local commit
Merging. Sure you can “branch” on svn but you merge at your own risk.
Subversion merging has mostly been fixed. I haven't really noticed much difference between the two systems.
One place where Subversion historically did better with respect to merging is avoiding merging by allowing you to lock files. We use this with some binary files in our repository. About a year ago Git added similar functionality but I haven't had the chance to try it yet.
What are some of the Git features that make a big difference to you? I use them on different projects and I end up using them both in the same very basic way (check out code, make changes, check code in).