The DVD produced by the MyDVD app on the 2008 MBP is a bit more user-friendly than the one done on the iMac two days ago. Both used the same original source material, the latest one needs no urging to play on a Mac , the older one was a tad cranky starting. Both play OK on stand-alone DVD jiggers, though. The newer disc has less free space than the older one despite having the same content.
I’ll be using the MyDVD app instead of Toast in future.