as slider said, it's a personal choice;
I would stick with the gear drive as it doesn't stretch and will outlast any timing chain and will withstand more torque (although typically they don't like to be revved as high e.g. > 6000rpm, but I doubt you'll be re-building your truck to rev high anyway).
However, you could sell the gear drive as second hand and probably get enough to buy a brand new high spec timing chain.
Either way it won't change the performance or running of your engine...