I don't think the make matters as much as long as the dehydrator has a fan, a thermostat and variable temperature controls.

I've found dried foods a little heavier than freeze-dried, but since I absolutely will not eat freeze-dried sawdust, there's no option for me. I do buy some freeze-dried items in bulk and add them to my meals (meat and some vegetables), and for longer trips I use freeze-dried fruit instead of home-dried.