First of all, look at the material of the meat grinder, because it is in direct contact with food, it must be food-grade, such as 304 stainless steel.
The second is to look at its performance, such as blade and power, a sharp blade and running speed can increase the speed of mincing. You can also listen to its noise. A meat grinder with good performance will not have too much noise.
Finally, choose a machine that is more convenient to clean, and avoid four corners that are not easy to clean.