Flexibility
Forex is, unlike other markets, a 24/7 market, or 24/5 for retail traders.
It means you are much more flexible in deciding when to trade, other than during the weekend.
You may choose to trade during the main sessions of London and/or New York or during the quieter hours of Asia, which, contrary to common belief, sometimes offer a favorable environment, although it requires more patience for something to play out.