Most important for a lot of people is that there is no chance of negative equity. You have a agreed a guaranteed future value of the car, which is bound by the consumer credit act so even in the unlikely event of the bottom falling out of the car industry, you would be protected.
Of course, the loan cost does not include the money you lose in depreciation. If you choose to sell your car after 3/4 years, then you will have to take the hit, and sell your car for the market value, which may be less, or more than the GFV. In the case of PCP, the provider will take the hit or pay you the difference. If you have paid upfront for the car, it's you that takes the hit on both counts.
In most cases, the car acts as security against your loan. If you need to take out an unsecured loan the chances are your APR will be higher than if the loan was secured. However if you take out a secured loan, it will usually be secured on your property or business if you have one. If things were to go wrong and your income is altered, you could end up losing more than just your car unless you have taken out extra loan protection which can be expensive. You could end up losing your house too if your loan is secured against it. If you have taken out early termination insurance (check), then you should be covered for any loss of job etc.
You always have the option to hand back your car at the end of the term, and avoid all the hassle of reselling. It’s worth noting too, that if you are handing your car back to the provider, and it is valued at more than the agreed GFV, then you will get the extra back, which you can then use as either a deposit on another car. However, should the car be valued at LESS than the GFV then you wil not have to make up the shortfall. Of course, if you have paid upfront for a car, then you have to take the hit and move on.
Always attractive, is the fact that you can have a car from new that you otherwise might not be able to afford. When you come to the end of the contract you know the car well enough to decide if you want to keep it. It’s also a great preference to some people that the car has been theirs from new, so they know its history, and that it has been treated well.