this is crypto trading so that nothing like that, up and down prices are always uncertain because they are always based on demand and supply. But if you are looking for an exchange that has a good trading volume so that it can help you to trade by looking up and down prices quickly then I can tell you some top class exchanges.
Op is asking a wrong question in my opinion, every market is hard to predict, both are risky, both unpredictable sometimes, with many surprises. What is the question what you need for start, with how much money you plan to start. In crypto you can start with 10 dollars and make some money along the way, if you place some good position in the right time. In forex you need much more money, much lower fluctuations and without huge spikes without future potential forex is left behind crypto trading.