I think probably Grande Dame is the better choice for both disease resistance and fragrance. I now have Grande Dame and It is proving to be a very good rose. In the past I’ve had MAAB, and I like it, but it was never very fragrant. I will admit that the first couple of seasons some of the stems were a little weak on GD so the huge blooms could be kind of floppy at times, that seems to have corrected itself now that it’s more established.

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I’d agree with Sara-Ann, Grande Dame is far more fragrant, and has better disease resistance than MissAAB. I do think the blooms of MissAAB are larger and more beautiful, but I’ve never found it to have more than moderate scent.