In the US, leverage/span margins are about the same. Intraday, however, you get some good margins with one of those $500 brokers.Quote from Traveler:
I'm going to say cash FX is popular due to customizable (small!) position sizing and high leverage compared to CME fx.
The best benefits of spot over futures is the customizeable size and the liquidity. CME has mini and micro contracts but there is relatively little liquidity on them.
Best benefit of futures is the central clearing of all contracts. Even in this day, there are still too many untrustworthy spot brokers looking for your business.