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I looked at a couple of boat's rating with deep keels and shoal keels and the difference seemed to be 6 to 9 sec/mi. Not a huge difference really.
I would prefer the deep draft version except for docking. I am looking for a boat in the 40 - 43 foot range for Lake Ontario (initially) and anything beyond 6' is a problem. Hence a shoal draft version would be the choice here.