LOL. A bit more info would help Oliver!
A Beta SP of what? Something you have already produced or something you are still planning, or.. ?
If its something still in the planning stage then what kind of program is it? Where are you planning to shoot it, US, Europe, ... ? What format are you shooting in, HD/SD? Do you have a prefered frame rate? Where will this distributor be distributing your work, US, Europe or Worldwide?
Failing all that as a basis for deciding which format to go with then choose PAL ... far nicer than yucky NTSC
Exactly, Oliver. If your film is finished in DV PAL and the distributor has asked for a BetaSP master then give him a Beta SP PAL master. This will ensure that the source he receives is the best possible quality from which he can generate whatever other copies he needs.