Buttercoin isn't a decentralized exchange, so it doesn't compare to them very well. The goal is to provide an open source trading engine (that one day might lead to a decentralized approach) and a stable, fast, secure, and legal reference trading platform built on top of it that can handle the kind of market volume that current exchanges can't.

The name was chosen since the domain was already owned by the creator. It's not set in stone.