Rotten Tomatoes pages:
"Godzilla x Kong: The New Empire": https://www.rottentomatoes.com/m/godzilla_x_kong_the_new_empire
"Kingdom of the Planet of the Apes": https://www.rottentomatoes.com/m/kingdom_of_the_planet_of_the_apes
I will use the "Tomatometer" scores (i.e. critics, not audience).
Details:
I will use the listed percentage score, however RT chooses to round it. In the rare case of an exact tie, I will resolve both options to 50% [1].
For reference, to compare with the previous movies in these franchises, "Godzilla vs Kong" earned a RT score of 76%, versus 94% for "War for the Planet of the Apes".
I will check both RT pages two weeks after the latter of the two films releases in theaters, and resolve the markets based on the score I find when I check.
Currently, "Kingdom of the Planet of the Apes" is expected to be the latter release on May 10th, so I plan to check both pages on May 24th.
If any aspects of the resolution criteria are unclear, please ask.
[1]. Normally I use a strictly greater than for a tiebreaker, but I wanted to try this new market format.
I made a MEGA-DASHBOARD for GODZILLA X KONG markets.
And here's a new market to predict the domestic opening weekend: