I.
Have complicated feelings about it!
I do not think you will appreciate "MaXXXine" at ALL without seeing "X." Like, you would be doing yourself a disservice. But at the same time, I think the currently-out films play better chronologically ("Pearl," then "X") than in release order!
"Pearl" is my favorite, but I can see why the filmmakers released "X" first; it needed that psycho-biddy shock value with zero audience prep. But when I rewatch, I watch "Pearl," then "X."