I don't think I've ever tried downloading the original Amazon format and my converted one to the same Kindle. I'm as happy with either one so I had no reason to. The features that I care about work equally well in either.
I think if you care about all the features the Kindle provides you're probably better off just reading the original formats. The features I use are sync, dictionary, text search, translation and Wikipedia lookup. Those work equally well on either.
Barry
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