General

You can use ANY scroll on a heart. Example: you can use a 100% sword for attack scroll on it and it will have 1 attk and 1 less slot then before.

Gold, because I can mass produce them on my mule if I wish to
yay me!

[quote=crazymaster]I prefer gold hearts, they have the most slots for easy to aquire materials. The difference is that better hearts require rarer materials but have more slots. Iron has 1 slot, gold has 3 and crystal has 5.[/quote]

This.

I prefer gold hearts, they have the most slots for easy to aquire materials. The difference is that better hearts require rarer materials but have more slots. Iron has 1 slot, gold has 3 and crystal has 5.

The slots