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This semester, I can take either Business Associations (some schools call it corporations) or Comparative Constitutional Design. I'm about equally interested in each.

Pros of Comparative Constitutional Design: course is only 6 weeks long (freeing up more time later in the semester), the curve is higher due to small class size, and a very well reputed professor teaches Business Associations in the spring

Pros of Business Associations: I can learn about useful stuff, class is possibly a prerequisite to other stuff I might like to take, is something of a core class that I'll end up taking eventually anyway.

If Bus. Assoc. is or is likely to be a pre-req for subsequent courses then you should do that class asap, so that you are not screwed later if you decide to take the subsequent courses.