I've had both the MSS buffet and the Fremont buffet. The only thing I like about the Fremont buffet is it's awesome 1980's Golden Girls motif. I feel like I'm on the set of the television show and Estelle Getty (RIP) is about to come out and say, "Picture, Sicily, 1924..."
Go with MSS all day, every day!
I've been there 3-4 times, I've brought my wife; my brother-in-law; friends from home and international travelers. Everyone has thoroughly enjoyed whenever they've eaten there. Don't let the low price make you think it's cheap, "I'll have some of the yella'--The bread puddin' is extra runny today, Clark" type quality...because it's not! Use the MRB coupon and you're in for a nice breakfast.