how to decide which one coin going to set up in masternode?
Many of the MN have 1700%+ ROI(like ABS), do you think that is real? They are mostly newly created and after two months lose value for 30x or like MAD coin where dev disappear and Everyone is stuck because they are waiting for an update.
I've been following MN story for a long time and it's very hard to find right currency
It's hard to say definitely as in case of the most of coins. Everyone decides by himself what coin to invest. We're just providing a MN infrastructure and its maintenance. It's like a mining pool but for MN-coins.