>Burial
I hate the idea of being eaten from the inside out by worms and other disgusting shit. Laying their eggs inside my flesh and the larvae feeding on me. Disgusting bodily fluids and worm excrement pooling around the corpse. I don't think that's a way to honour the dead. No amount of flowers and candles on top of my white marble grave would ever make up for what's actually happening underground.
And if you're in the camp that believes that what happens to us after death and that honouring the dead doesn't matter, you're barely any different than any other braindead nihilist and you should hang yourself. Then be left to rot out in the sun and get eaten by worms since you're so okay with it.
In my opinion, burials were nothing more than something primitive people came up with to quickly get rid of the dead. The whole putting up flowers, lighting candles and marking graves thing is just pretentious sugar-coating to try and mask the fact that they just left the body of their companion slowly rot underground and get eaten by old kinds of disgusting, disease-carrying insects. It's a very practice that should have been abolished by Western nations long ago.
>Cremation
I think that this should have been the standard way to treat bodies. In human culture fire is a cleansing power, it burns the filth and drives evil away. And even from a practical standpoint, cremation means bodies no longer take up space. As for co2 emissions, literally who cares. Anything can be used for fuel, there is no need for super hot furnaces. In fact, a plain old ancient Greek Athenian or Roman pyre would be best, it's better than the brutalist scene of a burning furnace.
>Cryopreservation
This is quite possibly the best choice if you want the dead to be remembered. The only other thing that comes anywhere near it is cremation followed by turning the ashes into memorial diamonds.
But if it was up me, if I was at the terminal stage of a disease, I'd prepare a 1-way ticket to the Himalayas, climb as high on mount everest as I can, find a nice corner to sit, take off my oxygen mask and wait for death to take me. Most bodies aren't taken down from that mountain, it's supposedly too much of a bother. What's more, the extreme temperatures and low amount of oxygen create an environment that prevents or at least slows down the decay of bodies, it depends on altitude and whether there's sun exposure. After a couple of years up there you look like a mummy, but without all the cruel shit that's normally required to mummify someone (organ removal, wrapping, entombment etc.)