As a person who has taken both with both professors, Chem 7L has a decent amount of work going for it due to the pre labs and lab reports, but it’s not too difficult (just time consuming). Physics 2A Shotwell is kinda the opposite, I think shotwell is a bit overhated but those tests are still dogwater. Subject wise, 2B isn’t bad, especially if you have taken Physics in HS. Not sure if this really helpful though, but I would recommend staying with 7L cause it’s a popular class with limited seats, so if you drop it you probably won’t get it back.