For the car, get something that can smash the window safely and cut a seatbelt.

For a knife, I, personally, would not go with anything swiss army. If you want a multitool, then a leatherman or gerber tend to be more useful. (primarily pliers rather than primarily knife) Ideally, I'd recommend a simple non-folding full-hilt knife for the blade component. Hinges are a common point of failure and when you're trying to rely on your blade, the last thing you want is for it to break off, or worse, fold onto your hand. Fixed blades are more reliable and safer to use.