I use both. I have a variable speed ROS (Bosch) that is used for most work. I also have a 1/4 sheet orbital sander (Makita) for places the ROS can't reach and for rubbing/buffing out finishes with non-woven abrasive pads. I also have a variable speed 3x21 belt sander (Ryobi) for the occasional heavy hitting. I find the ROS to be the most versatile, but the 1/4 sheet is also very useful in woodworking. Properly used with the proper grit sequence both types will leave wood just right for finishing.
I've gone out to find myself. If I return before I get back, have me wait for me.
"Sawdust is Man Glitter"