It is possible that an expert advisor that has medium results, to be much better than the expert advisor with the best performance now.
Even if you choose the best Forex EA from the list, you don't know how it will perform in the future.
There will be a constant process of adding new expert advisors with good expectancy and removing expert advisors with bad results.
No matter how many stats you watch, no matter how good the equity curve looks, you never know how it will perform in the future.
Even if this realtime resusts are good, there is no guarantee that the expert will have good performance in the future, but good results in demo is good indication for that.
https://fxzig.com/

Also when looking at the expectancy you must consider the fact that some instruments are with bigger value and their expectancy may look better just because of that.
https://fxzig.com/top20

The EURUSD expert advisors have executed 603 trades total with a summary output of 4345 points.
Above is the list of expert advisors that are working with EURUSD.
https://fxzig.com/eurusd