An OEM part is produced in accordance with the manufacturer's specifications and to the same standard, so this comes with a degree of reassurance in terms of its longevity. However, aftermarket parts can provide better value and quality that is close to, or in some cases better than the OEM specification. It is a matter of balancing cost versus quality - there will always be the option of very cheap parts that will not last as long. We would suggest looking for an aftermarket part for a reputable manufacturer that should provide a good balance of quality and value.