Kelli
I googled comparison of stamping inks and found this link:
Craft Critique: Craft product reviews, crafty news and crafting events!: Black Ink Pad Comparison Though it references black in the subject line, it also includes a nice list of which types of ink work well for different uses.
I used to have a blog comparison saved, but my old computer died and all my links with it. Hope this helps.
Rachael