Physics was way easier just because of all the homework. Lots of homework = lots of practice for tests. I also took it as a sophomore/junior.
Chem had like a homework assignment due every other week that was super long. Because I was a freshman at the time, I of course put it off and had to end up rushing to finish it. That left no time to learn the material and made the class much more difficult. That, and XBox live was just too much fun my freshman year.