It depends on the level of service and the experience you are looking for. It is hard to compare train to motorcoach. You will have more freedom to move about on a train, included meals and most likely better hotels with Rocky Mountaineer. If I found what you are refering to with Grand Circle or AAA tour - you are referring to the travel agency, not the tour. If you look at a sample itinerary for all the packages you are referring to you will have a better idea of what you are comparing. Rocky Mountaineer is more in line with a luxury day train and they are not fully escorted packages. They also have various classes of service on the train and at the hotels. You can mix the class of service, for example you can choose Gold Leaf on the train and Red Leaf hotels.
Ask yourself what experience you want, cost should not be the only deciding factor and you may not be comparing apples to apples.
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