You don't need to download the localized version. You can download your lp from the WU and change your display language
they are both the same BUT some features in enterprise (like pro edition) are turned off by default (not important ones)
I have it installed. It is the same apart from of course games. Applocker and DirectAccess are features Ultimate doesn't have and are useful to of course businesses. I am legally and genuinely activated and say it doesn't matter what version to choose. I would prefer to use Ultimate I would say because the branding annoys me but as I said no differences.