holonomic and crab drive systems are different.
crab drive is a heck of a lot more complicated to make, which is why many teams vote for omni, until they have an idea on how they work, before moving on to crab drive.
Crab drive is really good IMO, but heavier and harder to make. holonomic is still very good and quite a bit easier to build. If you want JesseK look up the many other threads on the comparsions.
I think overall all these factors will be based on the game, but I would do it anyways cause I think they are really fun to watch and really fun to drive!
