My recommendation, Team System isn't worth the money. I have used both and after using Team System, I tried to find a similar replacement. Basically what you are paying for is the integration and you could argue the customization support, but I have been able to create a Team System replacement with a little bit of time and integrating tools together.
I recently asked a question on what others have done to come up with a Team System alternative. I also list the development tools that I used to create the replacement. Hopefully with this answer and the question that I asked, you can find what works for you.
I am not a Team System hater, I just don't think it's worth the money. It is a very nice tool and if you don't mind paying the price for it, then by all means use it. It was the whole reason I created the replacement I came up with. I wanted the functionality Team System provided.
