Everybody has their own favorites but my experience is that any brand name DVD seems as good as any other but burning at the lowest speed definitely seems to improve the chance of an error free disk. I use NERO.

Although route finding was fine, I also found that the Dual layer disks (tried several brands) were very slow in retrieving travel info (say Petrol Stations within 20miles) but when I removed the language directories I didn't want from the ISO image to reduce its size and burnt the image to a single layer DVD, then this problem went away. Searchs for information are now much quicker.