I just stayed at the Prince Gallery and my take is that as a Marriott Plat+ (or whatever level gets lounge access curently as it's a LC so that lounge access isn't a published elite benefit any longer, I'm actually LTPP and PPwithAMB), I would probably take the price Gallery but if one is paying for lounge access, the price difference is about the same for the Prince Gallery as for the RC, so I'd pick the RC because the lounge is better (even though the Prino e Gallery has a very good lounge that seems to be quiet and exclusive, due partly to its small size). Also, kids under 12 are forbidden in the lounge starting with afternoon tea, but this wasn't enforced one evening as there was a very loud child of about age six that the lounge employees were fawning over. [I only saw the party once, so I don't know whether the kid created disturbances at breakfast.] This property has rooms with lounge access but apparently no club lounge floor or section of the hotel, which comprises floors 30 through 36 of a new building, supposedly the second highest (after Toronomon Hills, where the Andaz is located on the top floors) in the city.

Other considerations would be location, etc. There's a small shopping mall on the lower level, although it's oriented more toward local office workers, with lunch type restaurants and convenience services, although there is a grocery store.

Another consideration is that Prince is a Japanese chain, so it might seem to be more local in style and service, with more local guests, although this would presumably be the best of the (about forty) Prince hotels (and they have their own loyalty program too).

I was upgraded (without using SNAs) to a "premier" room with a SkyTree view (the lounge has a Tokyo Tower view, with both overlooking the Imperial Palace gardens), but the regular rooms seem like high end IKEA furnishings to me. I wan't a fan of the motion detector bright light in the toilet, nor of the random toilet seat temps that couldn't be controlled. Still, I liked the bathtub and rain shower. My bathroom had double bowl sinks, but they were very small and shallow. Toiletries were generous (look in the drawer) and decent. The room had two bathrobes, two sets of slippers, two yukata (spelling?), and two sets of white polished cotton PJs, but surprisingly used PJs weren't replaced.

The hotel includes a historic house (across the courtyard on level four) that has a French restaurant, cafe, and bar. There's some interesting modern art, including outdoor sculpture. I enjoyed a saki tasting (three cups of cold saki of different types, plus a beautiful snack presentation of spinach with crab, sashimi, and green tea peanuts) in the bar of the Japanese restaurant. The hotel also offers origami lessons, sushi preparation/tasting, and a couple other experiences listed on the inroom iPad.