First of all, I'm jealous you have both LD sets (I only have the original OT on VHS!), but from my understanding, the Faces set uses the same THX transfer as the DC. However the DC LDs are CAV encoded and should be slightly better than the Faces extended play. You will have to switch discs more for the DC set so convience may be a factor.

I'm not familiar with DVD-recorders or what format of DVD they use, DVD-/+r etc. or whether they can be played in regular DVD players. Let us know how it all turns out and if you might be willing to provide versions for your fellow less fortunate fans (like me!).