I guess cremated or whichever one is more environmentally friendly. I'm assuming that's cremation because all the embalming fluid and stuff they put into corpses--plus the coffins and the graveyard overcrowding--doesn't seem too eco-friendly to me. And normally I don't care much about the environment overall but I just have no opinion on burial options so this seems like a good compromise or something. (Though now I'm reading this thread and apparently it's not. Well, going with that anyway since I already wrote paragraph 2.)
I also have no desire for anything to happen to my ashes, if I go the cremation route. I think it would be kind of creepy for anyone (family or otherwise) to keep them around so I guess I'd probably just want to be tossed out anywhere. Sounds kind of lame but I'd be dead and gone so it's not like it would make a difference to my personally. I guess whatever my family is most comfortable with is my preference.