It's a little ambiguous because we don't know whether you mean why these brand names were chosen by you for your list, or why they were chosen by the manufacturer for their product. .
It's also incomplete because we don't know what the rationale is for. It's quite vague. I assume that's explained in surrounding sentences. Can you quote the surrounding sentences.
It's a little ambiguous because we don't know whether you mean why these brand names were chosen by you for your list, or why they were chosen by the manufacturer for their product. .