We all know we will have that dreaded day when the alternator goes out. They can be a pain and cost quite a bit. When you replace your alternator do you like to go with generic or OEM?
Do you have a Ford? All Ford manufactured cars are going to need the OEM. That is one of their special selling points. You could call a dealer. What kind of a car is it?
With something as vital as the alternator I'd go with OEM. You can do generics for other stuff but the alternator needs to be a quality you can count on.
It does depend on the car. I have gone with rebuilt generics and done ok but when it comes right down to it you are going to have the best bang for your buck with OEM.