Black Widows like seclusion. They will make a web in an area, usually out of the way, and will stay put, waiting for prey to come to them.
Brown Recluse are reclusive and do tend to stick to darker areas, out of the way.... but they don’t make webs and they don’t stay put. They are nearly constantly on the move looking for prey.
All things being equal (I.e. you have both in your area)..... Due to their habits, you’re more likely to come in contact With a Brown Recluse than a black widow in your day to day. You’re usually getting into an unusual location to find a widow.
And, recluses are more likely to bite than widows, when disturbed. So in my opinion they are more of a danger. I leave widows be.... recluses get an immediate death sentence.