I agree. I always wear my nails just oiled and buffed with the 1200 grit side of the CND Koala Buffer. It gives a satin finish that looks just like a natural healthy nail.I think the answer to your question is down to personal preference, but any one of the three options mentioned gives a nice finish to the enhancement IMO.
I have never thought of that I charge the same if they decide on just super shinny, buffed or uv topcoat.In the salon I charge extra for Polish, UV Finishing gloss or hand buffing to a high shine. All are treated as extras because they take extra time. Super Shiney is included in the price if that is what the client wants .. takes 2 minutes.