You need to be a bit more specific here, as the devil is definitely in the detail. With respect to piercings, there’s a world of difference between ears/navel and facial sites.
Hmm I like both of them, when I first started punting I would book girls with tattoos, sometimes piercings come with tattoos. But I like variety so girls without any ink are nice as well.
I guess if I was to choose maybe piercings because I sometimes worry about any extra sensitive areas. With tattoos I can look at a girls body and appreciate most of the artwork which is unique to each body.
Pierced tongues make me uncomfortable, I could not imagine doing that myself (painful). Nose rings, that would be a fat nope. Generally I also do not find piercings or tattoos on the face (excluding ears) visually appealing, same goes for hands with the tatts. Otherwise tasteful and imaginative tatts can be be pretty cool.