Same Wiring of Speakers and Speaker Cables

If you’re doing a rewiring project, I highly recommend tempo electric’s high purity solid core silver in an oversized Teflon jacket. They sell by the foot at very reasonable prices. No snake oil, just the highest quality, most electrically conductive wire, in the lowest dialectic insulation possible (mostly just air).

I already have their speaker cables and just bought enough to fully rewire my Coincident PREs last week. Replacing the binding posts with wago lever nuts as well so that I’m not having to energize big old chunks of metal just to start pushing a driver. The best binding posts are no binding posts. The wagos are low mass pure copper and clamp down really well. Rated for up to 600v @ 20a. They're worth hundreds, but only cost pennies.

http://www.tempoelectric.com/cables_DIY.htm
https://www.wago.com/us/lp-221

Find a cable sound you like and go from there. I like solid core as a general preference.

WireWorld has an excellent OCC wire designed specifically for internal rewiring as well as for jumpers between outboard power supply and speaker binding posts

When I owned my odyssey Stratos extreme and Odyssey Kismet floorstanding speakers, both were wired internally with a Groneberg Quattro Reference cables.  I bought the same cables to go from my  amp to speakers and the sound went up a few notches. The synergy was perfect.