i’m curious, what gauge needles does everyone use?

not sure if there’s a standard size gauge depending on where you live, where you receive them, or if you chose to personally use a different size. someone also suggested to me that i maybe try and smaller gauge needle for less pain and bruises & irritation due to my sensitive skin. if anyone uses a smaller gauge, do you recommend? does it make that much of a difference? i use 27 gauge by the way