Which pair benefits more from a big decline in the dow?

The gbp/usd or the usd/jpy or some other pair long or short

I think it’s usually been the USD/JPY short but not sure.

Any thoughts from people that may have researched this?

USD/JPY has been doing its own thing the last few weeks - sometimes rising in the face of a falling stock market, sometimes going nowhere. EUR/USD has probably been the most consistent mover (down) in the flight to safety trade.