Dashcoin and Bytecoin in MinerGate are IMHO safe, AEON is pretty much bad idea due to high network fees. I tried most of the other coins, but the mining profit was too low. Bytecoin is about 8x more profitable than Dashcoin miningwise, but it's so much easier to trade Dashcoin atleast on HitBTC. I've thought of nicehash, but I don't have enough money yet to invest in it.