I would agree that the two are likely the same alignment. mcmc being town and robz scum seems like the only plausible way this might not be true. however, Robz would be less likely to claim and clear mcmc in this case. This leaves us with the question, "if we lynch one them, which one should we lynch?". I think it is robz. there are many scenarios:
lynch mcmc, flip town. Gives robz some towncred, but not that much.
lynch mcmc, flip MU. Robz could be the third one, and makes his tracker claim very suspicious
lynch mcmc, flip Maquis. Again, Robz under lots of pressure
lynch mcmc, flip SK. Virtually impossible. Robz must have lied about his role, but why would he?
lynch Robz, flip town. We know mcmc took no night action night one, giving him more town cred than dsell probably.
lynch Robz, flip MU. Why would he claim unless mcmc is his partner?
lynch Robz, flip Maquis. ^^see above.
lynch Robz, flip SK. Virtually impossible. Why would he claim? To save him from getting NKed?
So robz seems like a much more informative lynch, and I think he is a bit more likely to flip scum. However, we know that chances are that neither of them are the SK, which makes them more likely to be town. Robz is probably the most informative lynch we have right now, but right now I don't really have much of a reason to believe that he is scum. I do not think that we should lynch mcmc today unless he does something really scummy.