I'm not going to address the reasons why you might, or might not want bass traps. I'll just answer your question. I've used Cotton Batting panels, Rockwool and Pressed fiberglass panels to make acoustic panels and bass traps.
I prefer making panels out of Owens Corning 703 & 705 fiberglass. It cut's more easily and straighter than the other two options. Additionally, when covering it with cloth, I find it comes out smoother than with the other two options if the cloth has contact with the insulating material.
If you wear long sleeves, disposable respirator and safety glasses you will not be bothered by the fiberglass.
Here is a link to a project that I did with fiberglass panels;
https://photos.app.goo.gl/1oKg2mjmU1tcBe4V9
I prefer making panels out of Owens Corning 703 & 705 fiberglass. It cut's more easily and straighter than the other two options. Additionally, when covering it with cloth, I find it comes out smoother than with the other two options if the cloth has contact with the insulating material.
If you wear long sleeves, disposable respirator and safety glasses you will not be bothered by the fiberglass.
Here is a link to a project that I did with fiberglass panels;
https://photos.app.goo.gl/1oKg2mjmU1tcBe4V9