Gulden is delivering the development. Tomorrow PoW2 witnessing activates and they have delivered on their whitepaper. This also comes with SegSig, 58% transaction savings compared to SegWit which is only 25% and many more innovative projects lined up.

In terms of delivering highest profits, best to look at coins with the best marketing and who are backed by people with large amounts of funding. ICOs are good for price increases because 90% is not in circulation so the prices can be easily manipulated up and down.
OmiseGO should bring in decent returns as they are doing development but if you look at pure development and innovation Gulden is by far the best value out there at $26million marketcap.