What is STS and SPS in SharePoint

SPS – SharePoint Portal Services

• It has better document management
• It has check-in, check-out, versioning, approval, publishing, subscriptions, categories, etc.
• It has a better search engine, and can crawl multiple content source
• It is better for an organization, and where Document Management is crucial.

STS – SharePoint Team Services
It is easier to manage and much better for a team environment where there is not much Document Management going on.
Above SPS features are not available in STS.

This is only for team based environments