Okay, first of all, why is Yu-Gi-Oh considered an "old" cartoon and Spongebob a "new" cartoon when Spongebob first aired in 1999 and the Yu-Gi-Oh TV series first aired in 2000?
I happen to like Scooby Doo better than all the others, but I grew up with it, and I went out of my way to grow up with it. I still love it to this day and I'll often watch old episodes from my extensive DVD collection.
Tom & Jerry and Looney Tunes are classics, but sad to say they don't have too much more going for them. Episodes don't vary significantly in either series, so aside from the characters themselves and the general premises of the shows themselves, one episode is generally not more memorable than another.
Aside from Spongebob, which I think is one of the most brilliant cartoons of all-time, I haven't really watched enough of the "new" cartoons to form an opinion about them.