Everybody seems to be asking the same simple question. What is the best/perfect trading system for forex.
And frankly I don't know. No one could possibly know.
There are too many historically profitable trading systems (next to infinite) – no one can investigate all of them. Furthermore, it is not possible to predict which one will work the best in the future.
The campaign for ideal trading system must be personalized.

Aggressive trading system using averaging - can open hundrets of trades per month.
What is the best trading system for me? What is the system, that can set me free and help achieve my financial goals. Considering my current situation. Risk appetite. My capital. My experience and my knowledge.

Candle trio : Conservative trading system with robust and infrequent entry signal. Opening just few hundret trades per decade.
Looking to get the universal perfect (the best) system, is like looking to get the unicorn. You will not find it and meanwhile you will get tricked into buying one.
The universal perfect system does not exist. Each one has its flaws. Each one needs to be mastered.
You need to find good enough system that will suit YOU the best. It is better to be simple kind of trader and look for something you love and understand.
If you are a scalping person, find a good scalper and master it. If you are looking to hold the position for longer, find the system that can do it. Master it.
There are traders out there killing it with various types of trading systems. What they have in common is: deep knowledge and understanding of that system.
Stop looking for the perfect system. Find one that is good enough and suits you the best. Master it.