Standard coiled cords last longer.
Retractable reels die sooner.
The reason is simple: moving parts. A retractable extension cord reel has a spring, a locking mechanism, and usually a plastic housing that takes abuse as the cord whips in and out. Over time the spring weakens, the lock jams, or the casing cracks. Then you’re stuck with a tangled mess that’s harder to fix than a normal cord.
A standard coiled cord has none of that. It’s just a length of cable wrapped around a frame. It can live in your garage or truck for twenty years with nothing to break. The cable itself wears out eventually, but the reel part won’t be the thing that fails first.
If you need fast, one-handed retraction in a shop situation, a retractable reel is convenient. But don’t kid yourself into thinking it’s built for the long haul. Buy a cheap retractable reel as a replaceable tool, not a heirloom.
A basic manual reel or cord and a storage bag will outlast your car.