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if you really wanna know. At least partially in theory and from stuff I have actually seen in comparison between ships both in fandom and show.
Grimmons had murder threats. Bickering, mutual body mutilations. Slow Burned to hell and back. Hot and Cold dynamic on both end. Ectra
Churboose had a multiple accounts of Church getting killed by Caboose. Stalking behavior. Brainwashing. Possessive behavior. Cold shut off vs Sunshine stalker (or as my discord put it yandere on tsundere action) ectra
(also discord points out. Simmons has the “yandere in him” its just not towards Grif. Also excuse me for using these phrases it just makes it easier to explain the dynamics)
I think it all boils down to priorities of the fandom at this time frame. Grimmons survived as a ship because both are still here
Churboose thrived in the past because it had stuff people (at the time) weren’t afraid to touch on. So it ended more popular.
Grimmons had its fair share of topics people were brave enough to touch at the time. But not to the level of Churboose.
So funny thing. Churboose got picked because the fans were numerous and dark.