A few years ago I wrote an article that appeared in a waterfowl hunting magazine that
described how I made the transition from steel to tungsten non-toxic shot.
In that article I discussed the “in the field” differences in knockdown power and penetration, and the overwhelming superiority of the tungsten alloy shot.
Since then there have been even more improvements in legal, non-toxic shot.
Below are some data points that may help you with your decision on which variation might best meet your needs.
This is still my preference. The alloy of tungsten and iron has 94% of the density of lead and delivers excellent downrange energy.
Because of its extreme hardness it requires a thicker shot cup that restricts the amount of shot that each shell is able to deliver down the barrel and ultimately to the target.