The bottom line with Rigondeaux is he lives off an online reputation, he's good but we don't know how good.
Last big move he made was Nonito Donaire years ago, that's it.
I pick Lomachenko, simply too big IMO. Skills sets are about equal.. But Rigo wants this fight badly and Lomachenko seems to dismiss the fight. So you'd have a very motivated Rigondeaux against a guy who has clearly stated he doesn't fancy the fight in Lomachenko. I also don't think Arum would take that risk with Loma either, last time he put one of his top guys in with Rigo, Rigo put on a master class.. Arum might even believe Loma wins, but even all the confidence in The world from Arum, he won't make this fight unless Lomachenko becomes interested in the fight and demands it.