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
i did a google search and confirmed two sources of solid core cable:

1) tara labs

2) parts connexion--legenburg cable
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.