Should the aliens speak English?

In the original trilogy, I can't recall any aliens (except for Admiral Ackbar) speaking English. They all seem to have their unique language. In contrast, just about all of the aliens speak English in the prequel trilogy. Off the top of my head, I can only remember Sebulba and the Geonosians speaking in a foreign dialect. The other aliens (Gungans, Watto, Neimoidians, Dexter Jettster, Utapauns, etc) all spoke English.



Which do you prefer? I prefer them speaking in their own dialect, but the characters being able to understand them or using C3PO as a translator.