The truth is that MT5 features many more interesting functions that help in trading while MT4, to my mind, has too many limitations. Let us discuss some of them.
An application for trading on financial markets, MetaTrader 4 was developed and is supported by MetaQuotes Software. Despite its quite deep history (released in 2005), MetaTrader 4 has been one of the most popular and actual software for traders ever since. Its recipe for success can be explained by three words, availability, simplicity, and effectiveness. MT4 terminal is free and multi lingual (supports about 40 languages), has a user-friendly interface all necessary features for manual and automated trading. Initially, the application was intended for trading on the Forex market, but later traders started using the terminals for other assets as well, such as CFDs on stocks, indices, cryptocurrencies, metals, commodities, etc. Result: an intuitive and user-friendly multi-purpose terminal, which allows to trade a wide range of instruments.