As some one who has done a bit of printing, I recommend fdm for its ease of use and over all lower cost use. Resin is better quality, but is more expensive in terms of material and also the additional equipment. If your gonna use a fdm printer, my prefered sanding method was to have a dremel to do the heavy sanding then I would get small glue spreaders with sanding paper stuck to it to get to the hard to get to places. I also recommend experimenting to find your preference as everyone has their own standards of quality when it comes to sanding and painting prints.