I'm curious on making a Pale Master wizard, but I've been having troubles understanding certain concepts.

As I understand it, when PM are in their "undead" form they receive their healing from negative energy spells and not from cure spells (or repair for warforged). Is this correct?

If the above is true, is there any significant advantage to playing a PM as a warforged vs. a flesh race (ie. drow)? I'm aware of the WF immunities and such. I'm simply wondering in regards to healing purposes.