You have to pick:

How long since the maggots have eaten?

I suspect it doesn't matter much since maggots usually don't have mouthparts robust enough to bite through undamaged human skin. Not that it makes the choice much easier.

I'd rather fall into the vat of maggots because if I were to wake up covered in them I'd be left with the question of where the heck they all came from. I wouldn't sleep well until that was answered.

Remember, maggots eat dead flesh.

Waking up covered in insect/larvae is a popular choice here. Seeing as it only happens once, I could live with it.