Toast:
The single most advantegous point for me in Toast:
? You don't have to copy the items into the new "disc" first and then burn. This cuts the burnig time in half, very important with DVDs.
For the most part, the built in disc burner is just fine, but if you want multi-session CDs, VideoCDs, mixed format (Audio+Data) CDs, Buffer Underrun protection, etc. Toast is the way to go.