An A-arm suspension is superior to the I-beam in terms of handling. However, you are limited to just how much travel (14-15 inches) you can get with the stock mounting locations without overly widening the front end. Now on the I-beam suspension you can get much more with the stock I-beam mounting locations but you do have to move the radius arm mounting locations back and use extended radius arms. But you can get 20+ inches of travel fairly easy. In terms of cost the I-beam suspension wins hands down. If I were to choose a truck to build as a prerunner it would definately be a pre '76 F150 with the I-beams.
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