SVN Importer plugin is one-shot converter from Subversion to Git; it allows one to convert SVN repository to Git right from Stash Web UI. The plugin just imports all SVN revisions and doesn't perform any synchronization afterwards.
So, if your goal is to import SVN repository to Git and shutdown SVN server after that (i.e. everyone in your team is going to use Git) then SVN Importer is the way to go for you.
However, if you're planning smooth migration, when both Subversion and Git repositories remain writable for some period, SubGit is a better choice.
SubGit is a tool that enables bi-directional synchronization between Subversion and Git repositories keeping both SVN and Git sides writable. At the moment we're working on Stash integration, soon it will be possible to use full-featured SubGit from Stash Web UI as well.
As to the quality of SVN to Git conversion, SVN Importer and SubGit share the same code, so the result of conversion is the same:
Many our users have reported significant speed boost comparing to other SVN to Git converters like git-svn and svn2git.
For more details feel free to contact us at firstname.lastname@example.org
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