The Feast of the Exceptional Rose 2023!

A question - for the first time, I have enough Masquing to get a 100-masquing companion. I’m wondering about any particular benefits that the Incognito Princess and the Devil-May-Care-Dowager may have - are there any options that open up by having them? Are they upgradeable at another feast? Just wondering why some of the 80-Masquing companions seem to have better stats (for example, the Abbot-Commander is +2 Monstrous Anatomy but Captain Amelia is only +1.)