What does longer a to a have to do with it? That isn't a reason to buy a bow. I bought my SQ2 specifically because it has a short a to a, as has many other shooters of the same or different brands.
My SQ2 shoots more acurately than did my previous 37" bow, and it works much better out of a tight treestand, or a ground blind.
A longer axle to axle length bow is generally considered more forgiving for the average shooter. Since this gentleman is a beginning shooter he is going to need all the forgiveness that a bow can deliver. Considering his two choices the FX design should be more forgiving for him to shoot.