Pokemon Soul Silver Iso What Game Should I Get, Pokemon Mystery Dungeon Explorers Of The Sky Or Pokemon Soul Silver?

What game should i get, pokemon mystery dungeon explorers of the sky or pokemon soul silver? - pokemon soul silver iso

I want to know if I should for the soul of Pokemon Silver from waiting to buy, or just Pokemon expl. Sky
*** I've already pokemon explorers of time, so I want to know whether its worth buying expl.of KP sky ***