I can do both on pretty much any guitar, electric or acoustic, clean or dirty, and have the notes stand out as equal to the plucked/strummed notes that I play. I used to think it was a common ability, until recently another guitarist pointed out that he needed distortion to do it. I started wondering and asking around, and it seems like doing the "pinch harmonics" thing is harder than I thought. It's always come easy to me on whatever guitar I play. How about you?