I prefer what I consider the more natural looking of the two, free form. Especially on courses with some elevation changes. It just looks too artificial to me to see squared corners. One of my favorite tees is on a par four, with the tee fronting a lake, the back tee actually forms a crescent, following the countour of the pond. The forward tees follow the same contour, but don't demand the forced carry. It fits quite naturally into the landscape.