Ordo has a good point there (once again... 😛 ). You can't compare a finished cartoon to one who is still running and being made as we speak.
Nevertheless there are some things that caught my attention:
I think TCW (especially the movie) has more eyecandy to it than the Gennedy series. But it's a different style of animation.
It would also seem to me that GL has had a bigger part in writing the old series' story, because it was the crossing between AOTC & ROTS. GL had to explain certain things: the capture of the chancellor, the rise of grievous, ...
I love both the series (It's SW, how could I not?!), but they're way too different to say that one of them is better than the other in my opinion.
PS: Samurai Jack pwns