What and Where for single fin

There are now,many different fin planshapes on the market, the main differences are:..... area in the tip(no flex) ie, the Hatchet fin, or,:.... a Greenough style which usually has some flex if not alot. The greenough style can have a lot of variances in planshape , sweep or uprightness and, is the most versatile of all the fins as its placement on the board can be varied to suit the style and weight of the surfer , this fin is my personal favourite ,its the end result of much proven experimentation over many years of both long and short boards. The Hatchet style has been taken in by lovers of noseriding,small wave specialist boards, which are a throwback to a kind of early 60s board. I'd personally would like to see some flex in the hatchet fin and getting away from so much roll in the bottom of the boards, but everything has its place , its just that some work so much better than others. With placement, this is dictated by planshape of the board and the bottom curve and tailift, and its experience that comes in here big time especially with glass on fins, this is where you need fellas like me.... So choose wisely its the difference in fins and foils that really make a bad or good board