Either way, it's always best to start from scratch and implemented only the logic.
I started ASP a long time ago (more than 12 years ago) and only in 2006 I moved to ASP.NET 2.0, not even today I know all, but I do know pretty much what I do everyday at work.
In my opinion now, and looking back to my knowledge of ASP I would go to Web Forms instead of MVC, first, it's a language that it's in the "market" some some yeras now and very used across the world, while MVC is still in Beta, so, not suitable for production environment (says Microsoft - even if this site is written in MVC).
I do tend to make confusion with MVC diagram still, and there are more tricks than I want to learn if I need to do a fast change of one ASP project.
