PLS and LSC kind of contradict each other in some ways though. And at points PLS comes off as an obvious 'winner' over LSC. Granted I only read a few chapters of LSC (after reading PLS). What I remember from LSC was this guy telling a story about the importance of being prepared for class, with an anecdote about a student getting grilled by his prof for having not read a case, and how embarrassing it was. However, I knew from reading PLS that class participation doesn't effect you final grade, since the final exam is everything. Therefore, getting grilled doesn't really make a difference, and class prep should only be done to the point where you can 'get by', with more time spent on exam prep.
Both books have their issues (and PLS has its crazy conspiracy theories) but PLS seems to be more of a 'realist' view of law school in terms of studying (regardless of whether you prep or not) while LSC seems to dispel the same old conventional wisdom plus 'rainbow briefing'. In other words, LSC seems geared to helping you learn a lot of information pertaining to the law and the cases, while PLS seems geared towards helping you get better grades. So it depends what you are looking for I guess.