WIthout arguing the entire point, the cable construction is very different. Apples to apples, and most times, I doubt people will spend the cash for a high strand count cable vs. solid for 99% of the applications out there. You're talking a cable designed for a high degree of flexibility or for a special application, such as audio, vs. general use. Even on the chart linked, look at the widely advertised differences based on construction details alone.az1324 said:Depends on the # of strands and size. For example he listed 22AWG as 16.14 ohms/1k-ft but 22AWG 7/30 stranded is listed at 14.74 ohms/1k-ft. That's almost 9% reduction.
There's also differences between manufacturers and circular mills and even conductor lay, so if the item is that mission critical, it would need to be looked into further, however if you're running close enough where an ohm makes or breaks the power loss calcs, you're choosing the wrong AWG for the application.