Mike, I've worked with the Tamiya trucks for well over a decade now and I've seen and handled the Wedico trucks. The argument can be made for either, but I suggest the Tamiya as a day-to-day unit being a preferred choice of truck.
Wedico: The Wedico unit has an all metal undercarriage, as well as drive-train, and a metal body. It is heavier and supposedly more durable than the 'plastic' of Tamiya and allows you to choose your optional parts as you build.
Tamiya: The Tamiya unit has a mostly metal undercarriage, with a 'plastic' drive-train, and a 'plastic' body; But the drive-train can be up-graded to a metal unit and the advantage to having a 'plastic' body is that it's far easier to modify and customize (most bodies on trucks today in the 1:1 scale are fiberglass anyway). It is lighter and (in my opinion) just as durable as a Wedico truck and comes in a kit that allows you a nearly RTR unit when finished. Anything you want to add as an 'after-market' item can be easily adapted and fitted at anytime during or after a build.
Just my thoughts
- RCT