This may be why Jeff Day and others using lower powered amplifiers enjoy the 16awg wire while folks like me, with powerful SS amps, enjoy the larger gauge wires.
Those who believe in skin effect for speaker cables would say there is a higher likelihood of hearing it with 10awg wire than with 16awg wire, even though both are stranded.
Keep in mind, this wire is tinned, not discretely coated with epoxy, like Cardas wire. IOW, the strands in this WE wire are electrically connected unlike Cardas wire where each strand is discrete. Therefore, this wire is likely to behave more like a single large solid core wire than multiple 30awg wires.
I don't believe in skin effect for the short lengths of our speaker cables so IMO and FWIW, the difference is likely related to the amplifiers, power, and sonic characteristics of the speakers. The 16awg wire may sound a touch quicker and slightly more "lit-up" while the 10awg wire may sound a little richer and fuller sounding, especially when used with high powered amplifiers. An alternative is to braid or twist multiple 16awg and/or 14awg WE wires, which I have done with success in my system.