In my opinion, MT4 is still the best solution only because dozens of additional indicators, tools and extensions have been created specifically for enthusiasts for this version. Of course, the newer version also has special advantages, but it does not support all the things created for MT4. This can be explained by something like a compatibility problem due to differences in the programming languages used in MT4 and MT5. Thus, traders will have to either continue to use MT4, or switch to MT5, but also forget about all these tools. At the same time, this transition period will be shorter if brokers suspend the provision of an older version or find a way to solve the compatibility problem.