Open 7/24. Cryptocurrency transactions happen in every sec. It gives you more freedom of when to trade according to your timetable. People who have a busy full time job can trade on weekends, while it is impossible for forex and stock market. The only problem would be that it is tiring to watch the market 7/24, you may simply use reliable trading bot to run your strategy and make money automatically 7/24
Potential. When Bitcoin was born, the price was less than 10 dollars. Within less than 10 yrs the price surges to more than 10,000 dollars! Regardless of Bitcoin, it is quite common to see coins increases 10-100 times in a few yrs’ time. Therefore it worths investing in crypto currency with potentials for the high return
Arbitrage. It is quite easy to do arbitrage in cryptocurrency. As cryptocurrency is still new, there are many arbitrage tricks that do not with stocks market anymore(due to high competition) still works with cryptos. You can either abitrage by buying cryprocurrency from one exchange at lower price and sell in another crypto exchange at higher price, or simply buy lower and sell higher in the same crypto exchange by market making.
If you are just starting, you may read more basics about cryptos. If you want to learn and become professional, you may go deeper into technical analysis, fundamental analysis and risk management.