Hey there guns,
- What software are you using to burn dvd's?
- What type of videos are you trying to burn (how many hours)?
The best thing to choose would be either video quality or high quality (HQ)
The only problem with copying them in high quality is that you will be able to fit less onto a DVD, for example you would probably only be able to fit two 1 hour videos onto one DVD.
It might be worth trying to create one in hq and one in lp and see how much more you can fit and whether the quality changes.