^^While both of the above comments are true, I actually meant which biome/environment usually depicted in nuclear post Apocalyptic fiction would be most likely to occur. Nuclear winter (like in the metro series) or a desert (like in mad max)

Most likely a bit of both.

Desertification will happen in several areas due to human plumbing and farmland falling into disrepair, but on the whole there will be a Nuclear Winter.

That could be a cool idea for a new Fallout game. A “Prehistoric” world but with landmarks EVEN more destroyed. Like the movie “Planet of the Apes”

One is an absolute fact. The other.....isn't.

True, Nuclear Winter is only assumed to be a side effect.

It's one of those things you can't really test for without killing a few billion.

^ No bro. I meant nuclear winter IS the absolute fact

If you think about Fallout could have happened in the real world. As the USA sent a false missile alert to a Small Russian base and there was a man named Stanislav Petrov, who knew it was a false threat and saved humanity. See Perry the Platypus I know my World History, except that I DONT

And also a a great Youtuber (Emplemon) made a video called “There may never be a man as strong as Stanislav Petrov” he explained it much better than I ever could.

I guess I always assumed the early Mad Max movies were set in the Australian Outback, which is a desert now rather than a result of nuclear armageddon.

Nuclear Winter is what would happen, in the long term places might end up becoming deserts because vegetation and wildlife are wiped out.

Well, deserts exist already, and if the world ends, then they will be post apocalyptic deserts. Nuclear weapons are not going to cause jungles to sprout up overnight in any of these arid locations, be it the Mojave, the Gobi, or what have you. So by default, these deserts are guaranteed to be post apocalyptic and will be so the very second the world "ends." A nuclear winter might occur, but an eventually is slower on the draw than instantaneously.