[Veselin Kolev]

mecanum and holonomic are very maneuverable, but they only have on average at best 70% efficiency. And they're arguably more complicated to program, needs sensors, etc.

swerve is a complicated system of wheel modules and takes time and money to fabricate, but is more efficient (more pushing power) than mecanum/holonomic. Still has a bit of programming to do, and sensors. swerve can also get heavy if weight isnt seriously taken into consideration during design.

6 wheel drive is simpler to fabricate, cheaper, and easy to program. however, you cant strafe sideways. you can turn arguably better than most other drives, but your robot will rock back and forth a little, which isnt always good.

personally, I'd go with 2 speed swerve. all you guys that think its too hard to pull off, too heavy, too expensive, too complicated, or overkill can have their opinions.