I didn't know that. I would have thought the deep draft version would have been more. You're right, I don't know why they even bother to make two versions with so little difference.The Catalina 27 was offered in two keel configs.
One has a max draft of 4 and the other, 3.5.
I am not familiar with Corpus Christi waters. I would hope there would be enough water to get around with a 4' draft?