So far, the Ethereum is the best of all the altcoins, although I am not emotional.
What makes one coin "best one"? Bitcoin is popular and interesting because it is first and already it is adopted very well, after few years been incognito. ETH still has chances but has no time, it will become obsolete very fast. This is not the case with Bitcoin.
Since last week after the darknet announcement that their Marketplace AlphaBay Will Enable Ethereum Payments integration by May 1st. After the news, Ethereum prices are moving quite fast. It is better to invest some money in this and if lucky can make some decent profit.