Unsure about which test scores to submit

Hi all,
I took the SAT once and ACT once, didn’t study for either of them, I know, pretty dumb.
My SAT score was only a 1410 (720 CRW, 690 M) but I found the ACT far easier after taking it on a whim last month–my ACT score was a 35 (Science 34, English 35, Math 36, Reading 36, and overall ELA 34, STEM 35).
On my SAT Essay, I got a perfect score of 8 8 8, but on ACT Essay, I only got a 10 (10 9 10 10), which I guess is what dropped my ELA to a 34.

I plan on going into International Relations, so obviously writing ability is important. Should I also submit my SAT for my better essay score, or should I only submit the ACT? I’m not really sure how much the essay will be considered or how much worse my SAT makes me look.

Thanks to those who respond.

ACT only

Definitely submit your ACT only. It’s far better than your SAT