Probably the one that’s included.
Well, this is interesting, I am looking at the picture of a PST-8 on Amazon and it shows a detachable 3' cord, and then I am looking at a PST-8 on Sweetwater and it is showing the power cord hardwired into the PST-8. Hmmmm? (The PST8 from 'Zon costs about $20 more.) I guess I'll order the one from 'Zon and unless someone on this thread advises agsindt, I think I'll grab a heavier cord that is 3' long. I think I'll order this one in 3' long: