I like Model Railroader, just because it's the 800lbs gorilla in the party and buy RMC if there is anything of interest - it tends to hang out in the "east coast" and "transition era" though, so it's not as applicable to me. I have nothing against it as a magazine however.
I also enjoy the Scale Rails I get with my NMRA membership. Currently they are running terrific layout reviews on layouts that will be on display at the next national convention.
When my father-in-law finishes with his Model Railroading News I get them - I think they've got the most unbiased and "real" product reviews going.