Which one is better? Fixed or variable spreads?

It depends on a trader’s needs and strategy. Usually, traders who trade more regularly but in smaller amounts prefer fixed spreads. Because fixed spreads can save them from costs of frequent transactions.

In times of high volatility, traders with smaller positions can get kicked out of the market due to sharp price movements with variable spreads. But traders with larger balances who prefer 'swing trading' benefit more from variable spreads because they plan their trades with a longer timeframe in mind.