DigitalOcean and Sendgrid (both techstars companies) probably have valuations exceeding 100m at this point.
A true measure of comparison would be to see the performance of companies that participated in TechStars Chicago, and not just TechStars as a whole.
Your access to the TS network is the same regardless of your location and that's the important part.
The mentor selection, who attends demo day, who holds office hours, all differ by location.