Their speeches.
The immunity determines who makes fire and helps them pair down their competitors.
Immunity is more important imo as it determines it. I think if you come back from fire, it does add a check to your resume but it’s not that big of a deal relative to the other 25 days worth of play.
It’s incredible advantageous to determine who you will be paired against so therefore I think immunity is far more important.
I’ve only started watching survivor in the modern era so perhaps my opinion is biased.