Depends on what works for you. I'm personally not a huge fan of slurping sounds like a full ear licking stream, but Saionji Mary's soft mama voice or Koinoya Mai's gentle hamuhamu make my dick explode.
I guess I'm not as into the type of ASMR that relies on me pretending the chuuba is right in front of me and interacting with my body, which would be blowjob type ASMR, I'm more into something like a countdown followed by a "good job holding it for so long" or whatever, so a chuuba as an observer just making pleasurable sounds while watching me masturbate, that's the good stuff. Akirose used to be a semen demon with this. Haachama was also good. Though she was very bratty and didn't take it super seriously, so your mileage may vary.
