727 question

by you saying "upgrade to a 71+ style" tells me the later ones are the ones to have ??

I know I have a few different years to choose from because there is a stack of 727s in the pile. I know one is 66 another is a 69 and two are 70 and a few others are 73+ and one is a 78. I know that is what is out there in my pile right off. I have always wondered which one would be best.

I am new to this because vast majority of my cars have been 3 and 4 speeds so I have never driven an auto very long so this is first time I am putting an auto in a car with intent to drive it long term