>>8
Well, you can almost be sure that all shounen manga adapted for anime, the original work is always better if you watched Dragon Ball, Maison Ikkoku, Saint Seiya...etc..It seems to me that shoujo manga is just the opposite such as Rozen Maiden, Cardcaptor Sakura, Sailor Moon... that I think the anime is much better. By the way KOR is 100% shounen although it's a romantic comedy.
I can't remember very well because I actually read the manga in the 80's but I do remember the anime cut out one female character of the manga whom I think is quite worthy to the story and many funny scenes in the manga was because of her. They also added two unworthy new characters to the anime, always come out from nowhere probably just for fixing the running time. As expected, the fan service of the manga was censored but even worse is that the fan service scenes of the manga was ingeniously attached as part of the story therefore some plots in the original story don't work anymore.
P.S. Many plots of the story had been plagiarized by other anime such as Seto No Hanayome and Keroro Gunso, if you notice that you know those ideas were originated from KOR.