Better to use a RANGE RIGHT or RANGE LEFT Partition Scheme
It's not a question of better or worse, but business requirements will drive that choice. For instance, we're talking about whether or not you want your defined boundary values to live in one partition or the next.

An example of a boundary value of '9/12/2013', would you want that boundary valued data to live in partition x (range left) or partition x + 1 (range right)?  This will especially come into play when you're thinking about things like individual partition management, as well as partition switching for purposes such as archiving.