It depends if your model has to align with existing elevation data. For orthometric height at least EGM96 should be used. Geoids make it easier to add GCP from surveying. Using custom geoid there is drawback that model will not correctly open in CC Viewer if the geoid is not added to viewer also. So check difference between OSGM15 and EGM96 and if difference is small then better use OSGM15 only for GCP but deliver model in EGM96 and say it is delivered in OSGM15
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