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Octomap and RTAB mapping are 2 popular 3D mapping techniques. These two have their own advantages and disadvantages, so we can choose any of this or a combination of the same based on our requirements. Octomap generates compact maps so it will consume only significantly less memory space and only need low computational power. at the same time, the RTAB map is built using the RGB depth graph-based slam approach. The main feature of the RTAB map is the representation of objects as it is in the map i.e in their real color, shape, and other features are preserved as much as possible. You can refer to the link to understand the difference between octomap and RTAB map and make a decision based on your requirements!