Upgraded Audio Quality
The new AirPods Pro sound better than AirPods 2. Early reviews back up this claim, and it makes a lot of sense considering the sealed design allows for more bass than an open ear AirPod can deliver.
While not Pro audio level, these can deliver better sound and you will notice a difference. If you primarily use AirPods to listen to music, it may be worth upgrading just to get the better sound.
Part of this is the Adaptive EQ, which tunes the audio to your specific ear shape.