If you're gonna be trading I'd say TradeOgre. Graviex is better for taking percentage of volume through ownership of GIO tokens. But they each serve a similar purpose so it really depends on which one has the trading pairs you need :)
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GIO tokens... Than you say, it pay for holders? Good, i like these stuffs, i like the passive income :) I'm not a big trader, its stressful for me. I prefer the "sit-and-wait-to-moneyrain" method :D