businessbrokeralabama.com won't set off any spam flags (not a huge issue since you won't be doing anything spammy, but why set them off when you don't have to?), plus it's quicker to type in and it's an exact match. Exact match domains still carry surprising value, especially in Google. I don't see any good reason to use the hyphenated one, just 301-redirect it to the non-hyphenated.