Only played a bit of both Spidey 3 and Ult Spidey, and enjoyed them both. I certainly intend to get back to each when I'm in the right mood for that sort of thing. Of the two I'd probably go with Ult Spidey, mainly because I love the look and presentation of the game. I think cel-shading works particularly well on the DS, and helps to mask some of the system's graphical shortcomings, not least of all the absense of texture filtering.