That is interesting that you have that kind of "problem" at your track. Usually its the other way around.
Trucks usually are the first vehicles people would start with in electric. They are easy to drive as they are wider and as they are heavier go a bit slower, same power to same power.
2wd buggies are alot more challenging to drive, and are nimble and quicker than 2wd stadium trucks. Tires are also cheaper as well, but, at least for me wear faster. If you can drive a 2wd buggy, you can drive a 2wd stadium truck.
I would say that if the buggy class is really big at your track, give it a shot. Its a rare thing that 2wd electric buggy is more popular than stadium track in alot of areas where both classes are run.