I think there is nothing like best altcoin. You have to make that decision for yourself. But there are many peomising coins that can make your while worth it. I believe ethereum is part, siacoin, litecoin and ripple. I trust in all these coins but ots a long standing coin. Not amytime soon.
Thank you for your help @tj4real, really. Bitcoin is my majority focus but i also think that ripple is a good bet in a long period. But do you think Ethereum or other will someday be the most important cryptocoin instead of bitcoin?