With your spending and stay habit, I think going for HH Diamond and MR Gold would be easier as it seems you have a higher CC spend than hotel stays. As you know, making MR plat year after year requires lot of nights. I am not sure if the MR Plat benefit is that much more than MR Gold, except for some better upgrades at select properties, but I am sure people will say the same for HH Diamond vs. Gold as well.