The doserless Rocky is less messy than the Sunbeam. The Rocky generates less static than the Sunbeam, so the grinds flow down the shute into the P/F evenly.
Bottom line, if you can afford to, go the Rocky, it is a considerably better grinder than the Sunbeam, mess or no mess.
If you dont have the budget, go with the Sunbeam - its not as though it chucks coffee grinds randomly around the kitchen! Worse case is that you need to keep a damp cloth handy to quickly wipe up the grinds that escape.