There is no emergency eject hole on a slot load drive. My friend has a CD stuck in his car player and it won't eject. I assume the label peeled from the heat in the car. There's no easy way to get out a stucked CD in the slot. There are more electro-mechanical parts to go bad.
The tray drives are more versatile and strudy. You can eject a CD with no power using a paper clip in that little hole.