It was discussed many times.
Those are some key threads/posts/article which I collected related to MT4 vs MT5 :
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MQL5 vs QLUA - Why trading operations in MQL5 are up to 28 times faster? - the article
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The Video from MQ: demonstration of the calculations on the GPU in MQL5 code and the graphics capabilities of the terminal
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The thread - Why is it better MT5 than MT4?? Does it have fewer limitations ???
The thread - Are you ready to give up MT4 for MT5 ?
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Why do most of the Algo startup using MT4 and not MT5 ?
what is the main advantege, still, in MT4 , and why do you still using it ?