I know of some individuals that have the Edge products and they do work good.
I've got a 2000 Ford F250 extended cab 4x4 with the Power Stroke (from when they still had forged rods) and automatic, the add-ons that I've put on it improved the fuel milage by better than 2.5 mpg at 70-80 mph. If I can keep it around 70 it'll average almost 22 mpg. Also, the performance has picked up considerably. The set-up is rather mild, and includes a 4-bank chip with Bully Dog programing (stock,50,75,125), 4" intake with K&N and 4" exhaust from the turbo back with straight thru muffler, ATS 1.15 compressor housing on turbo, Suncoast converter with Transgo shift kit and Sonnax valve, and of course gauges. As far as performance numbers, it should be right around 425 HP and 900+ lb/ft at the back tires. It may not be as fast as a hopped up 6.0, D-max, or Cummins, but it is reliable and gets the job done.
As far as which is better, that is a toss up, there are several quality suppliers in the diesel performance market. Banks, Edge, Bully Dog, ATS, TS are what most of the locals are running.
As with any other performance automobile, keep an eye on the EGTs, BOOST, and tranny temps. Most of the time everything else will be take care of it's self.