Good is relative for sure
In the "Main Brace", I think volume 30, there is an article on handicaping "the fleet". I think you may find it helpfull as it describes, in detail, the differences. In may opinion one must consider the use and chose to suit. There seems to be greater differences between style i.e. Fixed, fin, or swing keel than there are in the years. The year diff is mainly weight earlier equals lighter, and deck config, later equals new styleCheck it out