Well, I am getting ready to test this, but basically, it would seem that if you handle recovery properly and not like some nube who just takes his dbol until he runs out and then does nothing, you should be able to keep a substantial portion of your gains. Be smart and you should be fine either way.
Back to the original question, I would take the option 1, unless you know that you are really responsive to dbol, 20mg ED is not alot for dbol only cycle. 40 days is plenty long enough to find yourself more so you can run this for 8 weeks or so.