Also this would probably end up with a high majority remain vote, since the leave voters would be split between options A and B. Similar to the issues with First Past the Post.
While ever there's the prospect of no deal, there's probably a bias towards Remain anyway (as many who want to leave probably don't want to leave without a deal). This avoids that.
1. Do you want to remain? 2. Do you accept the negotiated deal?
As a remainer, the idea of a vote split is nice, I don't think its fair or defensible and just stores issues for later as Brexiteers wont accept the result.
Obviously if we choose to remain, the negotiated deal wouldn't be needed. That's just an issue with the current wording.
I'm not in favour of an open ended renegotiate option, we've had that, its a bit of a mess, but if parliament wants to put forward an actionable, achievable plan then I would be happy to vote on that.