Clearly neither is anything you'd call a liberal democracy but Iran is still a meaningful improvement on Saudi Arabia. In Iran ultimate power is held by the Ayatolla and theocrats but the elected part of the government has substantial power. And censorship, etc, are pretty consistently less encompassing in Iran than in Saudi Arabia.

https://freedomhouse.org/report/freedom-world/2018/iran

https://freedomhouse.org/report/freedom-world/2018/saudi-ara...

They're both horrible, oppressive places but if you were forced to move to one Iran would be the clear pick.