UW Madison vs BU vs CU Boulder for undergraduate computer science

I’m an international student deciding which school to attend. Let say if the cost is not a factor.

-Which one has the best cs undergraduate program?
-I’m particularly interested in robotics and AI. Which school offers most opportunities to work on projects or research related to that or any clubs to get involved in as an undergrad?
-What about internship opportunities and connections?
-Any unique opportunities for each school?

You missed it! That University was WPI. Projects are the main course at WPI in both robotics and CS at the undergraduate level.

You do have an excellent selection of opportunities. I’d look at current faculty activities which involve undergraduate students by browning around their websites.