I won't yell at you too much, but this topic has been discussed PLENTY of times and you should have had no trouble finding it by just searching.
But let's examine the facts...
laptop hard drives are, of course, designed for laptops... so they are much smaller, run cooler, use significantly less power, and are specifically designed to survive getting bumped around. It's fairly obvious from that that they're better for car use.
the cons are price, storage capacity, and speed... many people get away with using desktop HD's in the car, however I'll say from experience, go with a laptop HD if you can possibly afford it, it will help save your sanity when you've got other issues to deal with down the road.