I read through most of the information on this website and he appears to prefer different types of magnesium depending on the health condition. Overall, I think the information was presented in a way that was somewhat confusing.

I actually read where he states that "magnesium oxide and magnesium hydroxide are ineffective and magnesium glutamate and magnesium aspartate are potentially harmful."

He also no longer recommends magnesium glycinate (because he says it can interfere with taurine, an important amino acid for heart function).

So, to best answer your question...

Based on the research I've done, magnesium citrate or malate have been shown to be the most bioavailable forms and better absorbed than magnesium carbonate, chloride or oxide.

Personally, I use Magnesium Complex. I like the fact that it comes in capsule form and I can open the contents and pour them under my tongue for quicker absorption when I need it (like when I've got a muscle cramp or can feel one coming on).

Hope this helps!