The problem with the GUO is that it doesn't bring enough to the table. At it's top bracket it still only has 5 attacks which, though powerful are less useful in today's horde focused meta. Plus, even with deepstrike it is so slow that there is a good chance your opponent can just ignore him.
While rotigus suffers similarly he comes with more psychic powers, a shooting attack, and mortal wound aura. I'm not saying he is worth it in a competitive list either but compared to the standard GUO I would go with him.
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