I currently have, low level entry 3d printers just for playing around.
Creality 3D LD-002R LCD Resin and Creality Ender-3 V2 (FDM).
I find I get on personally with Resin a lot more, but I think the "useful" stuff really comes from the FDM printer as said above, printing parts etc.
FDM is much harder I think to get better prints and requires more patience, things will go wrong, it's trial and error at times.
Resin is awesome for miniatures, models etc, which can then be cured, primed, painted etc.
I would think, from what you've said, he would be more interested in a FDM printer.