I have a couple of bench grinders but these days if I want to sharpen tools etc I normally use my angle grinder. It is much faster, produces less heating, and I can get into the crook of my shears etc. I use a thin disc (meant for cutting) just to give a nice edge on a tool with minimal removal of material, and various coarser discs if there is much stock to remove prior to creating the edge. I also sharpen drills, give them split points etc all using the angle grinder. In every case the work is faster, with less heating and a better result vs the bench grinder.
If you are going to have a bench grinder come what may, it is worth noting that they mostly are fitted with induction motors. These are reliable and smooth-running (normally the shaft runs on a couple of cartridge bearings), but ultimately the torque is often lacking for heavy-duty work. BTW Cheap wheels go out of balance easily and if one starts to break up it can be incredibly dangerous.
cheers