yeah i think StC has the better layout (gazelle) but brokenstones has been around longer - pretty much anything you want you'll find on both except maybe serials (check macserialjunkie.com for those)
Brokenstones is much bigger and older, so it is easier to get into and easier to seed back. SavetheCoratee is slick looking and has some great crackers.
I haven't browsed either in a few months, but I'm sure that's all the same.