I use a sit in, and Insearchofish uses what I call a "hybrid". His is technically a "sit in", however his legs are mostly exposed, which makes it easier for him to get into and out, not like mine where my legs are hidden. All things being considered, stability is going to be about the same. Remember, most sit on tops are made for the ocean, and they do very well out there.
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It seems, in fact, as though the second half of a man`s life is made up of nothing, but the habits he has accumulated during the first half. All the best
Kayak Master