This is the most important question. I would argue that the probability of succesful reincarnation is much lower than 0.05, and thus I go with organ donation. One's probability calculations are going to change how one answers this question.

Its also worth noting that if one donates oneself to organ donation+scientific research (assuming we go the whole hog, which we might as well if we believe we will not be reaminated), the odds of me helping is definitely much higher than cyronics, and being risk averse is not necessarily a bad thing on a one time bet.