I just started using SVN as of last week (TortoiseSVN), is there any SVN client that's more popular?
I don't have quantifiable statistics, but I doubt it.
TortoiseSVN seems to be 'the one' that people use. Either that or the standard SVN command line tools.
I think the most popular SVN client would probably be the command line interface for SVN. TortoiseSVN is a graphical UI built on top of that.
If you want a graphical UI for Windows, Tortoise is probably the way to go.
I think that TortoiseSVN it's the best svn client for windows, it's supports many svn functions, great integration and very well maintained. Especially compared to all the other similar graphic tools, also from other platforms.
If you want some statistics, Ben has provided some good ones a while back. You should maybe read the whole thread to find out the shortcomings.
And these are the latest statistics from Google Code.