Really? Transformers the Movie has simplistic character designs, a REALLY spotty colour pallette which completely fails to be consistent, and the animation QUALITY fluctuates wildly between scenes.
The animation style itself is severely dated -- it looks like an old cartoon. But that's what popular culture works do... they age.
The main difference between a GOOD QUALITY cell animated show and a GOOD QUALITY CGI show will be this:
CGI will generally mean a better CHARACTER PERFORMANCE, as character performance is MORE EXPENSIVE in cell animation than it is in CGI because of the increased amount of art and framerate. With CGI good character animation is still expensive, but comparitively not so much.
Cell animation meanwhile will generally mean a MUCH LARGER cast. Which means we're talking about twenty to thirty characters vs. ten.
Depends what you prefer.
--Jhiaxus.