multitools as cool and handy as they might be,are intended to be carried on you in place of a well stocked tool box-
In a car,OTOH, you are not limited not by weight nor space, so the best would be to invest in a proper quality set of tools.

As for the "Crunch", it is an expensive thing, not as well equipped as a Swiss Tool, and doesn't have that jaws release "thingie"- there is no substitute foe the real thing, a good, tough and sturdy "Vise Grip".