Based on the class descriptions, it looks like bloc.io lasts approximately twice as long (8 weeks vs. ~4). However, the first three weeks will be spent covering Michael Hartl's rails tutorial.
I don't mean to be flip, but I am having a hard time determining what the value proposition is here. Hartl's tutorial, after all, is more than clear enough to work through on an independent basis. Shouldn't it be a course pre-requisite, and not part of the core material - especially at these rates?
edited: clarity / details