Unfortunately, it just depends on your components and system. I have had analog, digital, USB, or power cord make a huge difference… or not. I typically I do speaker cable first, then interconnects, amp power cords next, and finally USB, My dealer /friend says the biggest difference he has heard was with a USB. But for me it was a digital coax first, interconnects, amp power cord. But it just depends.
What equipment do you have?