You are asking what I like better, not what's better for you. Nobody here can really answer that. People can merely point out whether any specific feature is better on one or the other but only you can rank them. My brother in law has (had?) an early reservation from when I first told him about Lucid, before they were released. He didn't pull the trigger and when I asked why, he said it was because of DreamDrive vs FSD. Once I took him for a ride in mine, he was far more impressed. But what's best for him isn't what's best for me.
The best thing to do it test drive both. It would be hard to find a Pure on the used market, but not hard to find a Model S on the used market. And one that's still under warranty, especially if it's not showing any significant range loss, might be the most cost effective if you want to keep the cost down. New cars in general don't make the most financial sense given the first year depreciation, compared to how little functional value is lost. But if you get the Tesla, you give up what the Lucid has.
Or you could test drive whichever one is cheaper and see if it meets your needs. There's no reason to spend more if a car already satisfies you. No matter what you get, there will always be something better. As long as you don't find a car lacking, you might be better off not knowing what you are missing. I wouldn't necessarily take my own advice even though I should. But if you want to be rational about it, those are things to consider.