[conleec]

You can use the same license on either OS. By simply deauthorizing on one machine, you can move to another. As to which works best...well, that's subject to debate. You'll find people who will adamantly defend one platform over the other. Which tells me that it works well on either. Use the one you're most comfortable with, and you'll be fine.

This is actually Avid's audio forum. You'll get more responses in the Media Composer forum at: http://community.avid.com/forums/