Macbook vs. Macbook Pro Video output to a projector which is better?

OK, so I am having an argument with another guy about this. He swears that a macbook doesnt look as good as a macbook pro when being displayed on a projector.
My argument is: if you have and dvd, it will look the same when projected because the resolution is the same be it a MB or MBP. They swear it would look better because the MBP has a better video card than the MB. I wouldnt think this would make a difference because the output from the DVD is not that high (its not an HD signal) so at the highest resolution of the DVD, either MB or MBP could read this exactly the same. (I am talking DVI to VGA or Svideo on both MBs.)
So if its apples to apples (no pun intended) and both are connected from DVI to VGA (lets say) to a projector, they would both look the same...correct? Or are these guys right and the MPB would actually look much better?
Help me out peoples...
Oh and one of the guys swears up and down that S-video is better than VGA....I keep telling him NO, but he doesnt get it.

they will output video pixel for pixel identically. no worries. screen spanning has been around for 5+ years now, so even the "weakest" machines can do it admirably nowadays.
The screen image starts out on your video card as a digital signal. VGA is an analog signal. So you downgrade your digital (DVI) signal to analog (VGA) to get a picture this way. All VGA signals will look like crap (though they will of course look much better than s-video because VGA is a newer standard). You need to get a projector that accepts a digital input such as DVI, HDMI, or DisplayPort to have the best picture on whichever your machine is.
The only thing worse than this is using a DVI->VGA->DVI, which tries to convert a VGA signal back to digital DVI and degrades the signal further. It's like a xerox machine. Try to avoid digital->analog conversions!

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