Interconnects: solid or hollow core wire?


Which makes for better interconnects, all else being equal, single core or hollow core wire? Thin or thick gauge? Experience first, theory second!
pmboyd
Tempo Electric - Joe Levy. Single solid core pure silver. I use his IC from pre to amps, and SC.
Except for some flexible stuff for in-wall or something, I think Audioquest is all solid core.
Alpha-Core is a ribbon -- in my world a technically different critter than single core or hollow core.
Stereovox makes hollow core interconnects in their Studio Line. Yes, a single, HOLLOW-CORE wire: be careful bending! Anybody compared it to single core ics?