Thank you all! The Vantage seat certainly looks higher but I guess its an optical illusion or it IS a tad higher but somehow designed to not raise the C of G.
I should have made this an open Post as I am not even sure if this is Matt Miller's area but I remember his Revo advice was always good in the old days and didn't know who in particular to ask ATM.
My new, less-experienced, Hobie Dealer did say the lower seat was "better" for sailing but I felt that may have been a reasonable assumption not experience.
No fault of his, he was attempting to answer my question to the best of his knowledge.
This would be my second Revo the first was in 2007, I sold it when I bought my AI and have regretted not keeping it ever since.
PS: After studying the figures and seeing that the Adventure is only about 3Kg heavier than the Revo and has a Folding Skeg and faster hull I am now thinking I will get that model instead.
My early model AI cannot be upgraded with the improved Rudder Lift mechanism or the larger sailing Rudder neither can I fit the small sail to it so another boat is "necessary"
(it is also a struggle to disconnect the AMA from the AI on its trailer in a tiny garage and drag it off and on to my car. After living with cancer for 10 years I am as weak as cat. To be able to have a Hobie ready to go as a Kayak would make Yakking much easier.)