 Many Worlds: Both RQM and the Many Worlds interpretation (see Vaidman 2002 [2018]) are rooted in the work of Everett (1957). Both attempt to solve the mystery of quantum theory by adding a level of indexicality. In RQM, variables have values with respect to other physical systems. In Many Worlds, variables have values with respect to branches of the universal wave function. In neither interpretations there is an a priori special role for measurement, or observers. The difference is the profoundly distinct ontological commitment: the Many Worlds interpretation is based on a realist interpretation of the universal wave function, which obeys a deterministic evolution law. This implies that the Many Worlds interpretation must then work hard to recover Heisenberg uncertainty (via branch indexicality), probabilities (via subjective interpretation of probability), and discreteness. RQM has all this easily in its foundation. On the other hand, the Many Worlds interpretation is based on a (according to some, inflated, but) no-nonsense realist metaphysics, which is precluded to RQM. The two can perhaps made closer by the simple observation that modality can always be transformed into multiple world realism à la Lewis (1986), trading actuality for indexicality.