Max length of IC's? Long IC's vs short SW

What's better sonically?

a) To run 4 foot unbalanced interconnects between my preamp and amp and 32 foot runs of speaker wire,

or

b) To run 9 - 12 foot unbalanced interconnects between my preamp and map and 12 foot runs of speaker wire?

Also: what's the max length I can go on unbalanced interconnects before I run into issues of resistance, inductance, capacitance, etc. that would significantly affect the sound?

Is there much of a difference between 9 foot unbalanced and 12 foot or 15 unbalanced?

Thanks.

Laurence