If there were only two motor oils in the world, and those were my two choices, I would have to say the mobil drive clean.
But, my opinion is that I wouldn't use either of them. I like havoline or chevron supreme.
I would probably choose the Mobil Drive Clean. As the name implies, I think it may have a bit better detergency.
I'd rather have Castrol, Pennzoil, or Havoline though.
I think there are some voa's here.