This does not necessarily make ERUS a better fund however. If Rogers is correct about Russian markets doing well from here then it might make sense to favor the smaller cap-biased RBL because in many markets it is small cap companies that outperform early in a bull phase and RBL offers more exposure.
Because both funds have roughly 50% in energy they are both likely to be proxies for the energy sector as well as proxies for the Russian stock market. It is therefore important to consider the amount of energy these funds do have and how much exposure the rest of your portfolio already has to energy. If the price of oil and gas were to go down a lot then both ETFs should also be expected to go down a lot.
At the time of publication, the author held no positions in any of the stocks mentioned.