The manga was better. Now this is not to say that the anime was not good. It was hysterical. It's just that the manga is that much better, and fans who have read it first should not expect to be blown away. However, if you haven't read the manga, you will be beside yourself with laughter for the first several episodes, and you will find yourself pulling for the characters throughout the series. And then when you read the manga (you won't be able to resist), you can repeat these feelings all over again.
However, there are some downsides. This series is crammed full of filler, and can only be matched in that aspect by Dragonball Z (which, by the way, is 291 episodes long). Also, if you're going to watch this, subtitles are a must. This is one of the worst - if not the absolute worst - dubs I have ever seen. Kitsune for the most part sounds like a drunk Dixie Chick, and Su has some sort of accent that sounds like an unnatural blend of Russian and Indian. Motoko sounds like "Izzy" from the Digimon dub, and Shinobu and Naru, while having voices that relatively fit their characters, are acted adequately at best. All this is amplified one hundred times when you take into account that the original had such a stellar voice cast, in fact one of the BEST in anime. Keitaro is probably the best in the English cast, but still can't hold a candle to Ueda Yuji. No one can squeal like this guy!
So all in all, I highly recommend this series to anyone, anime fan or just a fan of good laughs. Just make sure you read fast.