Quote from RedDuke:
The spread on major pairs at CME is 1 tick where spot fx has anywhere from 1 to 4 ticks on major, and higher of exotics. Do not be fooled by no commissions, you pay them within the spread.
Risk management has nothing to do with whether you trade 1 standard lot or 1 mini lot. It all depends on your style, leverage and your funds.
Also, in spot fx you do not have volume, market depth and time and sales which are very important. And there is no central price as well, like I mentioned before.
Try to execute few 10 million trade in Oanda and hold them for short time and then liquidate, you will get warning about this being not allowed, and I am not talking about during news times. And if you continue, you will be asked to close the account. FXCM usually put you on manual, not sure what they doing now. If they were really just after the spread, they would love you to do it over and over and over, but they are not.
If you trade on long term with wide stops, then it does not really matter (to do this you need large account and minimal leverage which most do not have), but if your style is intra day, then watch out within forex bucket shops.
There plenty good brokers to trade futures with, for example Velocity, Advantage, Mirus, IB.
Regards,
redduke