Depends on how it was drawn in the first place. I guess it's like vanilla and chocolate ice cream. Those doesn't taste the same, but you have the right to love both. I don't get a word of the songs, but they are still great. Every Sailormoon fan will agree with me when I say that Moonlight Densentu is one hundred times better then the NA Sailor Moon Theme.
Subs are a great opportunity to learn a few things specific to the Japanese culture.
I especially liked the notes in the end credit of Fushigi Yuugi . Those where handy. 1- Subs require more attention from the person who watch them. In order to get all the story, you must keep reading the subtitles. Therefore, you might miss some little visual detail.