Thanks for your reply araki :-)
I found the criteria :-)
Everybody write that Monero, Ether and Bitcoin are the best, but their volatility became very small. I think that Monero, Ether and Bticoin were the best in their time respectively. You have to choose the future new coins. I found Qtum, Pascal and BOScoin. Qtum is much more known than BOScoin. It might be worth to invest in Qtum and maybe in Pascal.
And what do you think about the ardor altcoin please?