Which is the best vehicles in motorstorm

On Motorstorm Monument Valley, Rally car is the fastest and best but very hard to control.
Big Rigs are the best on muddy tracks
Bikes are the best on Sidewinder and they are the easiest to control.

On Motorstorm Pacific Rift, Big Rig might have a lot of wins on time attack, but that doesn't mean take it online because it is so slow to accelerate.
There isn't really a best on Motorstorm Pacific Rift, you choose your vehicle