I would lean toward solid for your intended use also.
Stranded or solid core for digital audio cable?
All else being equal, which is a better cable for connecting a CD transport or a DVD player to a D/A converter or a digital audio processor, a 75 ohm cable:
a) with a solid center conductor (i.e. Canare L-4CFB) or
b) with a stranded center conductor (i.e. Canare LV-61S)?
a) with a solid center conductor (i.e. Canare L-4CFB) or
b) with a stranded center conductor (i.e. Canare LV-61S)?