Most companies, from what I have heard, will only accept VHS reels because like Kurt said, it's cheap, and easy to use.
Now, the main reason most companies don't want CD's, or DVD's, is because of all the different codecs that people use. They don't have the time to download drivers, specific software, or codecs so they can view your CD. Where as a VHS tape is 100% compatible with all VHS players.
They aren't concerned with the "best quality image" as much as you think. In fact, if the original quality image is good, it should still look good on VHS.
But this doesn't mean that in light of you getting an interview, that you can't take in a CD or DVD of your work to show. Just make sure you have everything you need to install, or setup the computer so you can show it.