The best choice depends on the types of projects you expect to complete most often. If your workload includes residential foundations, fencing, decking, and occasional commercial jobs, a versatile hydraulic driver is usually more practical than highly specialized equipment. I recently looked through the ground screw drivers section at
https://iron-mechanics.com/product-category/ground-screw-drivers/, and it gives a useful overview of machines designed for different installation requirements without making the comparison overly complicated.