1BB3 is pretty straightforward and I thought it was definitely a lighter workload (course review:
http://www.macinsiders.com/showthrea...tr=H&t=37 027 ). It's also a 1-st year courses versus a second-year one, and they're meant as an introduction to a specific area of study, compared to second year courses which may build on some prior knowledge. 2J03 is also a seminar course so it depends on the prof teaching it that term, because it can vary, so previous course reviews won't really help if the course has a new topic and prof this year, which it does.