I want to buy an Exceed 1/10 Nitro, but can’t decide which model. What are the differences between the Forza, Mutant, and the Infinity besides the obvious Buggy, Truggy, and Truck. Is one faster or more agile? Why does the Truck have 8 shocks? Can the Buggy traverse grass as easily as the Truck? Any opinion or technical fact is appreciated.