There is no best answer. It starts by having the most accurate point cloud possible, thus unless you are using a TOF camera, the 3d reconstruction won't be good (well it depends how accurate you are comfortable with).
For Tango/iOS-Lidar data, there is an example of config:
https://github.com/introlab/rtabmap/wiki/Multi-Session-Mapping-with-RTAB-Map-Tango#7-export-the-meshIncreasing poisson depth would increase the number of polygons, but will also be less robust to noise.
Multiband option would give the best texturing.
Cheers,
Mathieu