The earlier animation was a bit rougher, but it is my favorite. The newer animation is a lot cleaner and more detailed...

http://img2.timeinc.net/ew/dynamic/imgs/100108/Simpsons-1990_320.jpg

http://seat42f.com/images/stories/tvshows/Simpsons/Season22/Simpsons-Season-22.jpg

While I like the earlier episodes better (seasons 3-5 were the "golden era"), I really like the current look of the show. It looks great in HD.

Earlier was much better overall.

The early animation was best.