Should I buy the ½ HP Rikon the 1 HP Rikon grinder or the 3/4 HP WoodTurners Wonders grinder?

It depends: The 1 HP motor reaches its maximum speed in approximately 2 seconds, the 3/4 PH 3-4 seconds, while the ½ HP motor takes 7-10 seconds to reach its maximum speed, depending on the type of wheels being used. This is the main difference between the grinders. The 1 HP grinder has a light that is on the same switch as the grinder while the 3/4 HP light is independently switched. All three machines are capable of completing the task, especially when used with CBN wheels, as they cut very effectively with minimal pressure. If you frequently reshape tools, particularly through heavy grinding, it would be prudent to choose the 1 HP motor, as its additional power will result in a longer lifespan in the long run.