i dislike Truetype because of two reasons; it has Hinting problems within the glyph's and also they can be problematic when goin through a postscript rip!! Although in new machinery the problems have been solved but if you find something from the 90's you can be screwed!
Apple had a good go at trans format fonts but as they did it independent from adobe they just seem to have missed a couple of things out.
Opentype all the way... can't go wrong