Depends on the deck you want to built. Pokémon [SP] decks need both to be honest. DPt1 has Rampados in case you want a fast beatdown deck. Combined with Lucario this deck can be rather nice.
BET has more collection value IMO. Because of the 4 and GL cards.
Platinum is out in a month anyway. The onlt difference is it has cards taken from IFDS and has bad looking shiny Pokémon.