I agree with the comment that it's a personal preference. Many look at various power cords as tunning devices to achieve the sound that the listener is looking for, it's not necessary to stay with the same manufacturer however there is nothing wrong with that. The major goal is to achieve the sound you want.
PC manufacturers?
I prefer to buy my power cables used. I look for cables that are in good condition, well reviewed and fair priced. As I look at my collection, I have a mix of manufacturers and I wonder if that's a good approach...My question, should I find a brand I like and stick with it throughout my system or is reasonable to mix quality cables?