I ride a good hunk of Annandale road going to and from work. It’s not the most pleasant, but it’s pretty safe. My main issue is the amount of crap in the road that never ever seems to get swept up, especially on the uphill section just past the park. I’m not sure there’s any safer direct routes through there. I already get off and cut over on Carol or one of the other roads to get across Arlington Blvd.
Between the two, I prefer Sleepy Hollow, but both are better than average, and probably why they are “recommended” routes.
Please stay off the sidewalk though…