I usually get directly infront of girls. When I think about it it seems a bit scary. A stranger directly blocks your way and tells you that you look cute. (By the way are there any guides you can recommend for this stopping style? maybe I do something wrong.)

Other approach is tapping from back of shoulder with saying 'excuse me' or whatever. This is Todd V recommends at The System. This looks like it makes it too easy for her to walk away, I've never tried this approach.

Which one do you think should be adopted or used more oftenly?