Mount then directly into the studs.
Both of those look good. The trouble is, I'm looking at hanging 20 - 30 guitars. (Some are customers.) At $13 to $20 ea., those hangers add up fast.
Then again, I may just have to bite the bullet and do it.
I lucked out and found them on sale at GC for $5 a pop and bought an entire case of them. I think they might have been closer to $15-20 regular price.
The triangular hole patterm means that one of thos screws, possibly two, will end up in the drywall. Regardless of whether you go with Fretrest or Hercules, look for two hole pattern in a vertical line. That way, both screws go straight into the stud.