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I think being burned alive would be a worse way to go than being buried alive. At least you would run out of oxygen fairly quickly on the latter.
Son, you got a panty on your head.

Not to mention you could outrun a scorpion if you see it first.
I've no idea why that made me laugh so.

You felt a lump in your breast, you looked at your wife and saw a stranger

Lost at sea seems the most depressing because you have nothing but time to contemplate your very probable death. But I would rank slow, painful torture over being buried alive.
Now another "which way is worse" question is death via: lost at sea; lost in the desert; or lost in the rainforest? My parents and I discussed this in length after watching the movie. I think we concluded lost in the rainforest. Being lost in the desert you dehydrate so fast (with all the perspiring on top of the lack of water) that your death is fairly quickat least quicker than at sea where the cooler water subsides a little more of the perspiration. Not to mention at sea you risk the pain of jellyfish/shark bites etc. True, you could be bitten by a scorpion in the desert, but I still believe you'd pass out/die from the heat and dehydration before much could happen to you. Not to mention you could outrun a scorpion if you see it first. You don't really get a chance to "out swim" jellyfish or sharks since it's harder to see them swimming around/below you.
Now the rainforest! Since there are ways to acquire water in the rain forest, it's less likely dehydration will get to you as fast as the desert or sea. So that means in the time leading up to your inevitable death (because that's what we're working with in this hypothetical) you face a lot more unpleasantries and a lot more potentially uncomfortable deaths. You can die from malaria from mosquito bites; gangrene from an infected wound (and the moisture certainly boosts infection possibilities); dysentery from drinking bacteria/parasite ridden water found pooled on various surfaces; snake bites; army ant bites; mauled by jaguars/pumas/etc; poisonous frogs; charged by wild boar Not to mention, in my opinion, humidity is far more insufferable than dry heat.
Wow, I think I've given this far too much thought!

Amn, brother, well observed.

Terrifying to be sure. There is no place you can drop someone in this universe without a more horrific prospect. Deep under the ocean? Fast death. Out in space? Fast death. In the middle of a desert? You could survive it. Middle of the ocean? You will die a slow and torturous death, the water will dissolve your skin, the sun will burn it off, the sharks will come to feed, or you can kill yourself. Nothing but horror in every direction.

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Especially if they slow roasted you.

I dunno, being burned alive would suck a lot more in my book.

drowning would be worse than shark attack imo. Not being able to breath is torture.