Hmm, I say whichever will make you more tired. You could try them both out and see which one does a better job. Yeah, you don't really want to focus too much attention on anything while WILDing. You want to just relax and just feel as comfortable as you could possibly be. The breathing will be like a running background to your entire process. You don't want to get to where you are forcing your breathing, anticipating it, analyzing it, or thinking too much about it. You just want to hear it as you work toward falling asleep. Once you get into SP, you can use the HH to keep you conscious, but until then, keep your anchor subtle.