I personally am new here, so I haven't had that much (pretty much none) experience with the Sword Arts, so my opinion is mostly based on video games and D&D. I personally like "Proposal B" more because it seems like a progressive system, because if you're high enough to get to the top of the Sword Arts, you're probably on the front lines fighting gosh knows what, and that means you're already super powerful. Now that might seem unfair to the front-line fighters since this is coming from a new person that basically knows nothing, but that's just the way I see it.