It is a real murky business and highly unregulated sector. Don't go for the ECN brokers review website's rank list, because the websites owners are got paid by referring customers to those brokers. If I can, I will go for the forex traders forum to see what's their honest user experience. There is one here from https://www.forexfactory.com/thread/969465-tradecom-brokerage-reviews
You can learn a lot from those traders from their real experience.