what ECN is best?

Hi everybody,
I daytrade stocks remotely through a prop firm.
I am not very familiar which ECN should I choose ....
My software is set on NY/AM for listed stocks, and ARCA for otc.
I constantly receive messages messages promoted EDGA : no cost for removing liquidity....etc

Somebody care to elaborate what they use and why?

Tkx a lot.
 
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