Bitcoin ,Ethereum and Steemit are the top 3 coins to invest your cash in if your want a good return. I don't see Dash as a long term profitable coins.
Steemit is a Mickey mouse crypto, don't lump it together with BTC, ETH and DASH. Dash is an early kinda anon BTC fork, it uses 2MB blocks already and masternode network, the transaction number is limited, but once they solve their bottleneck it could take on the top spots. It's faster and cheaper than BTC already, can't see it overtaking BCH though. One of the bigger DASH problems is the masternode system, can't really be that useful if more than half coins are removed from circulation by staking nodes.