I think you mean #5, and while I've had good (limited) experience with Sublime, but one of my other favorite tools (SourceTree) is absolutely horrendous on Windows. Just a single data point.
But the UI aside, the problem I was having is that it would just entirely hang the app if you had a large number of changed files or large diffs. This was about three months ago, so it's possible the performance problems have been fixed.
Haven't found a good alternative on Windows for a Git GUI tool that comes with Git-Flow.