Crawlspace is better. You just make your access and then you can drill down with a flexible bit. Pass the cable down, some twine on the other side, then you o

Crawlspace is better. You just make your access and then you can drill down with a flexible bit. Pass the cable down, some twine on the other side, then you only have one quick crawl to pull the cable and maybe put up some cable staples to keep it out of the way. In the attic you have to fish the cable all the way down, makes it harder.