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Because they have better quality. Graphics is probably the most, but maybe some speech errors as well. Now graphics its been HD ednon

-not remastered (original funimation) is only 276 episodes. plus the quality is old but still somewhat good. with the remastered version, the quality has been improved, its 291 epsiodes long becouse it is uncut, and you can choose between english or japanese dub. click this link to see remastered vs Original: -Eilerdor