TU was probably the best of the non-canon spin-offs of the OVAs. They kept the characters closer in feel to the originals than Shin TM! (or Tenchi in Tokyo here in the states) and didn't mess around with the designs too much. Throw in the fact that my first exposure to TM! was the first movie, and I think it's a pretty decent stand-alone series.
Having said that however, it just does not compare to the original OVAs. Even with fewer episodes, they go further in depth for the characters as well as the setting. The designs have become more refined in the third OVA while still retaining the original feel.
Now don't get me wrong. I love Kiyone as a character, but it was a poor decision on the part of Hasegawa-san to use that name for her. That name had been reserved for Tenchi's mother from the beginning by Kajashima-san. If you want a detailed breakdown of the various continuities, try
here. It's where I learned ALOT about the series(eseses...es).
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