I do agree with the Panem = RU idea in a lot of aspects, but something that definitely stands out to me most is that the former is actually a lot better of a place to live than the Republican Union. While the citizens of the Capitol do look down on the people of the Districts, and the Hunger Games are in and of themselves despicable, most of the Districts aren't as bad as 12 is shown to be in the books and movies. 1, 2, and 4 are all made out to be as pretty nice places to live, and the others mostly fall into the category of "OTL third world country" rather than out-and-out dystopia, with Districts 11 and 12 being notable standouts (and probably other ones I'm forgetting). And, though the Hunger Games are horrific, they certainly adhere to the idea of "to the victor go the spoils," with the winners becoming fabulously wealthy and set for life. If a Hunger Games took place between Inferiors in the RU, there would be no winner. The victor would be killed by ORRA the instant they stepped out of the arena. And, for the most part, the Capitol appears to be somewhat egalitarian in its measures (though that equality equates to "everyone suffers equally," as opposed to racial/ethnic discrimination).
In short, if given the choice between living in the world of the Hunger Games or living in the world of the Madness-verse, I would choose the Hunger Games every time.