Stealthing omni vs. cards is going to be a trade-off issue that is person dependent.
Omnis will be more forgiving of head movements to the left and right (during playback), but you pick up more crowd noise.
Cards will be less forgiving of head movements to the left and right (during playback), but you cut out more crowd noise.
Some folks prefer cards mounted on their collars due to the freedom of head movement issue.
Note: The above comments weren't based on personal experience; I stayed at that hotel chain last night.