The sub is more serious sounding and is a reflection of what the directors vision was. The english version is a mangling of what cowboy bebop was intended to be. Heck Faye in japanese sounds like a 25 year old woman while in the English version she sounds 40.
> also don't see why it needs to be like how normal people talk, because it's literally a cartoon.
You realize that anime is a genre in itself that can be as serious as anything else out there? Japanese voice actors are the best in the world. Cowboy bebop has comedic elements but the genre is NOT cartoon, it's science fiction noir with a jazzy element and kung fu. Nowhere in there is "cartoon."
I think you like cartoons. And you like the warped version of what cowboy bebop was not intended to be. Or is this really true? The ending was serious. Was the ending still cartoony to you?
Maybe it isn't that you like cartoons. Maybe you're just use to the voice actors and can see past the horrible acting. Or maybe you're not use to subs. Even so the fact that you can hear the bad acting from the dub shows that you're preference is less than objective. The Japanese version has definitively better acting.
I can't accept the dubbed versions level of acting in a regular Hollywood movie, so I can't accept it if it's in an anime too. The bar doesn't lower for me just because it's an animation, but I guess it does for you.