While Super Mario Bros. 2 introduced some new ideas, it felt out of place in the Mario series, and I feel that SMB3 is the true sequel to the original Super Mario Bros. if SMB2 would be branded as a new series, it would make a lot more sense. I also wonder why Nintendo just didn't make a game like SMB3 as the first sequel (other than that they wanted to put out a sequel ASAP), it would make a lot more sense to me.
So Option 2 for me.
So Option 2 for me.