I recently saw both movies and both movies are very similar to eachother (I wonder if all Japanese horror movies are similar to the premise of the Ring and the Grudge).
Which one did you guys like better if you have seen both movies. I personally liked The Ring alot better. The Ring spent alot more time developing its characters than The Grudge did (The Grudge spent so much time in flashbacks that it eventually became kind of hard to follow).
And one thing though that really in my mind made The Ring alot better movie is that by the end of the movie you know exactly who the villian is and for the most part why she is doing the things she is doing. By the end of The Grudge you are still almost as clueless as to who the main villian is and their motives as you were at the beginning of the movie.