When it comes to excavation tools, Its all about the dirt you are working in...so try to find some posts of guys who hunt in your area that have already put in the in field time and study what they use to narrow down the field of prospects....
Dirt is the primary determinant...and it changes throughout the seasons...Wet clay in the Fall and Spring, dry in the Summer...different rigs required for different locations and dirt conditions..."The Right Tool for the Job"...a screwdriver is perfect on an active Sports field, but not so much in a plowed bean field or at the beach...A narrow blade, a big blade, a D handled tiling spade, a lockback knife, two different sandscoops, all sorts of excavation gear is rolling around in my trunk and ready to go depending!