Yes, a strategy that can go long/short according to the market conditions has to be a winner in forex. Eventually in the stock market this fails because if prices fall very heavily, so does liquidity. So its good in theory to short a falling stock but eventually the spreads and illiquidity catch up with that tactic. Stock prices can go to zero.
I am basically a trend-follower but the break-out strategies are trend-neutral. But as long as there is good volatility on the markets, GBP/JPY will make frequent big moves per day and GBP/USD will rocket out of its London opening range.
Both have reputations for volatility. Some good traders won’t touch GBP/USD. GBP/JPY is known as the Dragon - its easy to get burnt by a dragon.