The PM system is better here. You can edit messages (for a little while afterwards) for one. Their inbox is fairly ugly and messy for looking through.
I feel like people here are more open to smutty stories/shorter RPs. Over there it feels like folks want a sprawling epic.
With RTs: On E, you can have up to 4 threads on the first page, and there's no limit to how many are "active". Here you can only have 2 threads, period. So while BM's bumping policy is far more relaxed, when you want something different you gotta delete one of your threads. The bumping policy also means that pretty much you're going to see the same threads every day from active users, rather than the page being different day to day.
Them pushing people to have an Ons/Offs page, dedicated to detailing what a person wants, is very useful.
To be honest though I've had far better success rate on E, in terms of RPs. I don't know why.