Enemy outlines

obligatory info, im new to this game

I learnt a lot of people use yellow enemy outlines than red. This kinda confuses me because i definitely feel like red ones are brighter and easier to see than yellow ones.

What color do you use and why?

Yellow and purple because I find them overall easier to see, red is sometimes hard to see for me, while I have no problems with the others

Yellow because i have glasses that filter blue light and makes yellow pop-out more (compared to when I don't have glasses). Makes it easier to see enemies

yellow cuz better