Neither, because suicide is self-murder, FK, and therefore one of the worst sins one can commit. I don't think Jesus committed suicide. But, obviously, God allowed His execution because it was necessary that He die in order to resurrect. And without resurrection there would be no Christianity.
Besides, not every time one willingly acts in a way that brings about his own death, it is a suicide. A soldier in a war, for example, is not committing a suicide when bravery causes him his life.
OK, I agree with you here, Kosta, (and with the point Alex makes a few posts later). The source post (the one that made me nuts over the supposition that Jesus was "killed" as opposed to freely giving up His life for us :) was from Agrarian and I thought you were in full agreement with the whole thing. But now that I think of it, God allowing it doesn't really answer the question. Did God allow men to kill a physically helpless Jesus, or did God allow Jesus to freely give His life. These are very different.