One thing is true that mt5 is based on new programming and comply with NFA rules that is a plus advantag, But we give more advantage
to mt4 the reason is we are more familier with the mt4 and most of EA's and indicator are made for this termina Currently MT5 is not popular as MT4 because MT4 supports a lot of indicators. If you trade on pure price action then you can try MT5. MT5 supports some custom time
frame which MT4 does not. Like MT5 supports 3hr chart. I suggest you to try demo both MT4 and MT5