maybe I´ve not the biggest experience in doing a photogrammetry scan. But all I tried was poorer by far than a scan by DAVID.
Nowadays I cann´t get almost equal results as DAVID scanning results. If there´s anybody out there who can, please post and we could do a comparison.
Photogrammetry (at its current state) is a possibility to capture big scenes where DAVID sucks (e.g to capture a whole building) but on things that fit into a corner.... An advantage of photo based systems is the better quality of texture (for you can process high res images). Its mesh-results might become better and better in the future . Nowadays, IMO, it is only an option if you are interested in a rough mesh that carries a good texture (e.g. for 3D web presentation of a product).
Sure, there are some stunning photogrammetry results of body scans out there. But, as far as I can see, those are made using a bunch of calibrated and simultaneously triggered cams, not only a single digicam you move after each shot.
To add an affordable photo-based local application, see: www.agisoft.ru
just to add my 2 cents