Aquarian explains it for us.
http://www.aquariandrumheads.com/products/drumhead-guide-comparison
Aquarian has a great site.
It took me a while to find the chart when I first visited.
Im probably gonna be looking at getting a new resonant kick head(just recently got an emad batter), a new snare batter, and new tom batters.
Should i go by what the website suggest for hard rock?
Aquarian heads are killer!
Is you are an Emperor guy, then try the Responce 2's those are about the same.