the 8.8 is a good axle for some because it is rougly the same width as the dana 30 ( only a half inch difference) and has the same bolt pattern as your front end ( 5 on 4.5). plus all the other goodies such as disc brake, limted slip..large range of gear ratios.
as for the 9 inch, if you arnt swapping out your front end it wouldnt help you much. it has a different bolt patter and youll never find one that is the right width.