From what I have read so far resin has better support with smaller points of contact. The layer banding is a lot less noticeable (note the layer 'thickness' is about the same) since you don't have the slightly rounded ends of the smushed layer of plastic. Fine details are easier to achieve. I have seen comparable extrusion detail but they are highly tuned where the resin machines /seem/ to just work (haven't eveer used one myself).

For me the downsides are the resin itself. Resin can be nasty sticky stuff before it is cured. There is residue needing to cleaned off finished parts. Left over resin in the build resivoir. Resin must be stored properly and used within a certain time frame after a container is opened. The peachy printer in particular adds water in to the mix which I'm not sure how you handle when the print is done.