Yeah, I'm a member on a couple audiophile forums as well (DACs, headphone amps, etc.). And the BS these people believe is uncanny. I can't believe the average audiophile drops $800+ on headphone cables and they swear up and down they all sound night/day different. Like, oh I just bought this $950 silver double dragon viper cable with triple Litz braided silk cover and it really made the mids punchy and thick and smoothed out the highs while boosting the bass and making it really tight. I don't comment on that stuff. And after doing some digging you can find out what wire these companies use and it usually turns out to be the same Canare, Mogami, or Kimber wire you can get for $0.60/foot. Companies put some Techflex over it and braid it up to look fancy and charge $800 for it. I should get into the cable business...
Anyway, I don't believe for one second that any two- or three-foot speaker cable from guitar amp to cab will sound different from any other. And if it does, then I'd love to see the measurements on those cables. Signal generator, scope, resistance, capacitance, and inductance measurements. Show me on a frequency response graph that two cables make a guitar amp sound audibly different. Resistance matters and will affect speaker damping. But in a short cable of reasonable gauge, you aren't going to hear a difference. Now if one of those cables is like 8 inches thick and the other is 1mm thick, sure... there's a measurable difference. But is it even audible at those extremes? I'm skeptical.
But hey, if someone hears a difference, let 'em be happy.