6ARC or 6.5 Grendel, talk me into either!

[NATEWA]

https://www.shootingillustrated.com/content/head-to-head-6-mm-arc-vs-6-5-grendel/

I decided to stick with 6mm arc but haven’t shot it yet. I can’t find brass for it. Will eventually reload.

[Jimi Jah]

I get less drop at over 10,000 feet. Wind is thin up there. Even .22's drop less.