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I'd suggest the RH. We had a great time, enjoyed a great upgrade (without SNA) and especially enjoyed the breakfast (with buy up).
Being your honeymoon, I believe the RH has better ambiance and location. While there's nothing wrong with the location of the Westin, it gets traffic from the PK (across the street) and might have more noise with the street performers (often great) and the market across the street. The RH is connected to a nice mall and the street looks quite nice with all the lit torches.