It is also worth considering the effects of bio accumulation. Reactors are not going to stop leeching radioactive waste into the ecosystem for quite some time. The particles are often chemical mimics of other elements. IIRC plutonium is an iron mimic for example. They can be carried by almost any life form, and the higher up the chain a life form is the greater the concentration becomes over time. It is a vector that takes longer to spread, but it is not readily detected as the creature must often be chemically processed to release the radioactive particles.
It's seems a little too morbid and pointless to me to try to prove which disaster is worse, but whatever the truth is the problem from both reactors will persist for generations. Even the "coffin" that the Chernobyl reactor is encased in is only a temporary measure. The radioactive material inside of it is infinitely patient and will steadily burn through it. The cost of building it was immense in terms of material expense and lives. We NEED at least 3 more similar efforts in Japan, and after that we will have bought time to figure out the riddle of how to move something you cannot get close enough to touch.
Then we need to hope or pray or whatever that the other containment on the hundreds of other reactors world wide remains perfect in function. Of course this is impossible, entropy being what it is.
Not that I consume anything other than pure light, another handy way to "increase" the gradient of that vector is to describe bio-magnification, in addition to accumulation. I tnk magnification is supposed to be when you factor exposure to greater concentrations as you move up the predator ranks. Humans that eat big fish that eat smaller fish that eat littler fish etc... Essentially it's just to show that the accumulation is not linear, it's worse, if you practice unholy acts like whatever it is you do with the fishy fish-sticks

(eh, sorry about the hair splitting, I don't even think magnification is part of the lexicon anymore and was adequatly described by your account of accumulation, like I said