There are more than 1000 altcoins in the market. What do you think for the most stable altcoins?
Open Coinmarketcap here
https://coinmarketcap.com/All on top 30-40 are stable coins. You will see some movement in ranking, but all have gained value in last 12 months.
I agree with you Sir that the Top 30 altcoins are the most stable in terms of market vulnerability. Blue chips altcoins are very reliable in long term investment. But if you really want bigger earnings I usually go with the ICO's but risk factor is really high as it is on the developing stage.