What are some alternatives?
When comparing Visual Studio Team Services and Helix ALM, you can also consider the following products
codeBeamer ALM - Integrated application lifecycle management (ALM) platform
PractiTest - PractiTest is a cloud based Innovative test management tool.
Atlassian Bitbucket Server - Atlassian Bitbucket Server is a scalable collaborative Git solution.
Mercurial SCM - Mercurial is a free, distributed source control management tool.
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Optimizely - A/B testing you'll actually use.