the worst looking vita game will diffidently look better than the best looking 3ds game since it's hardware is much better and stronger than it.i agree with that... look at the DS games most of them is lack of graphics but when someone push the Console to the limit they create a list of a good graphics games...but the sad part of that they create a good graphic game when the DS life is really low...
TBH even the best looking DS games still look like bad PSP games on a good day though. I'd say the same for the 3DS although the gap is a bit smaller.