And they have been smart. They could easily have put all three of those models in the one case, but they have done some smart marketing and realised that the things is small enough and cheap enough that they can persuade people to buy one of each.
An argument for buying the distorted version would be traveling light. No need to carry anything to put on the floor or make room for it on stage. After all, the purpose of this amp is convenience and economy of space.
The Vid shows they have more power. They have their own support speaker... Cool! Haven't done a conversion in a while, but doesn't that make it about $400 US?