My favorite of those three is the mp15 because you get the most to do with it, otherwise I’d say the 363 if you prefer German stuff.
If you play a lot MSB / RSN then go for 204 / 363. Otherwise - like nberneck99 said This is about which of these 3 routes You like most.
I think you did. It's quite a challenge to drive or to be more precise, to stop. But in my opinion an excellent DLC.