All you Japanese anime and Japanophiles, are you kidding me?! Seriously, just because something is in Japanese doesn't make it instantly better or cool. The fact that you are obsessed with the culture obviously puts a bias spin on things.
That being said, the ORIGINAL work is always that way to go. It expresses the intent of the writers/creators of the show.
As a Japanese American, I understand both cultures and languages, and let me tell you, the original is by far superior. Let me go on to say that Japanese bronies and pegasisters are pretty upset with the changes of the show, calling it an inferior version. The comparison video is actually Japanese fans mocking and upset over the cuts, changes to the original theme, voices, etc...they do NOT like the dub and prefer the original to be subbed instead....like what most of you Japanese anime fanboys/girls want for Japanese anime. They state MLP is dead. Half of the VA for the dub have are newcomers, case in point. Take a look at a screen cap posted...the discussion is also on reddit.
Don't be so blind as to think, "it's Japanese, it's better." Would you say the same for other shows, say, Batman TAS? Do you really think that the Japanese dub of TAS is better, especially against the likes of Kevin Conroy or Mark Hamill? Don't kid yourselves.
Take a step back and let go of the novelty of the "foreign language/culture"...you'll find then without bias the original is better in 99.9% of the cases; MLP:FIM also of note.