Shielded hookup wire & twisting

[Tonewood]

Hi all-

Anyone have comments on their favorite shielded wire. I'm interested in both single & double conductor and single twisted pair- all shielded. I'm thinking lighter gauge for signal and heavier for heater wiring. It's hard to determine workability looking at it online.

Also:
Does it help to shield the twisted heater wires?
Does it help to twist others- like signal too and from volume control via shielded twisted pair?

thanks