Keep in mind that the two materials have different densities and strength/weight ratios. As it stands, there are manufacturers who make plastics with the same precision as metals, so saying that the quality is any different is debatable. However, metal seems to be better suited to the task simply because it is stronger and denser for the same amount of material. This allows manufacturers to use a wider variety of designs because:
- A stronger material can be used to lessen weight in certain areas without risk of breakage
- A denser material can be used to put more weight in certain areas without using up as much space
Of course, those two go hand-in-hand. As you can see, the two points will neutralize each other, but ONLY if the ratios are kept the same.
I am no manufacturer, but I think it is common knowledge that commonly used metals are better suited towards making yoyos because it has a better strength:material ratio. That gives the benefit of more options when thinking about distributing the weight and keeping the strength of a yoyo so that it doesn’t bend or break over time.This is often seen when you compare two yoyos that have been precisely machined, one plastic and one metal. An example is some of Crucial’s earlier delrin yoyos. They often have fatter rims to maintain the same amount of spin. They are also lighter for the same amount of material used. A metal yoyo can get away with thinner cup walls, thicker rims, or whatever design the person wants to create. It’s all about exploring design options.
These thoughts are just based on pure plastic vs pure metal yoyos. I’ll have to think about hybrids a little bit more, although I’ll let you know right now that there is equal, if not greater, potential in hybrids when compared to a pure yoyo of either material.