We did not evaluate other options when we switched from SourceSafe to TFS.

I chose IBM Rational Team Concert because I worked in partner consulting. The tool was recommended and it was good, but I felt that it consumed a lot of our resources. It's not too easy to configure, but it managed the majority of things which Visual Studio Team Services performs. It's a very competitive tool, but it's expensive and also it consumes a lot of power.

We have not explored other options because our clients prefer the solution.