@greenpainting good info.
To add that Mirka spent a lot of years moving the auto trade away from wet n dry. In a straight “abrasive” comparison where you can use a dustless sanding device, there is no advantage of wet over dustless in terms of finish. The grades are equally coarse to super fine, and finishes of the highest order can be achieved. Mechanical sanding should be faster and less fatiguing than manual sanding.
If you can’t get a dustless set up to suit the profile or surface you are tackling, and you can’t afford to create dust, the old fashioned wet n dry is still your friend.
This is a tip on sanding profiles and sanding sponges http://traditionalpainter.com/wet-sanding-sponge-for-mouldings-on-kitchen-doors