Brakes on a 2021? How many miles have you racked up(shouldn't need anything till around 40K)? Performance pack size or standard?
Spend the extra 70 buck for piece of mind(FCP is a reputable company)...haven't heard of R1 concept until today. I assume the are purchasing there stuff from an Chinese OEM(granting ecs does the same thing) and rebranding with their name, Some parts are good, other suck...roll the dice.
Zimmerman is quality. EBC reds are MEH, for a daily, but aren't great. There are performing options for less money.
You can look at brake parts kits at ECStuning.com and shopdap.com as well.
If you do run into an issue and have to return shopdap,fcp, and ecs are a known quantity...R1 could be a dude in this mom's basement drop shipping parts and the hassle if you do have an issues is not worth the 70-100 bucks you saved.
Again R1 may be good, but I don't have any experience...hopefully others do.