Either one would be fine as a driver, both have their advantages and sisadvantages, though. The tortion bar suspension is easily adjustable for ride jight and spring rate by simply turning the adjuster bolts, and will give a smooth ride. But many of the susspension components, namely the balljoints, are either non-existant, hard to find, or if you do find them, very expensive. There's also virtually no upgrades for them, such as disk brakes.
The coil spring suspension also gives a smooth ride, but in order to get either a softer ride or higher spring rate for heavier loads, you have to disassemble the suspension and replace springs, or for ride hight alone, the spindles. However, there is much better parts availability as most of the parts are the same up to the '70 model year. Upgrades such as disk brakes are easier, too. There's several kits that either use the original spindl e or replaces it with one for both a brake and lowering upgrade, or you can swap in later spindles from a '73-'87 simply be swapping to the later style balljoints. Then there's even one other option, and that's to use the entire '73-'87 front suspension crossmember, which will get you power steering, too. It only requires drilling 4 holes to install.
To answere the last question, well, yes and no. The basic layout is the same, but there are some components differences, primarily in the balljoints ans spindles. This has more to do with the braking system that the actual suspension, though. And those parts can be adapted by simply swapping to the later balljoints, as they can be interchanged.
