If you compare the two main cryptocurrency, namely Bitcoin and Ethereum, which one has the most promising future?
In terms of evolution, Bitcoin reached a maximum of roughly 4800$, whereas Ethereum reached roughly 394$: in other words, it is a potential increase of 33 % for Ethereum, but only 24% for Bitcoin.
I think it should not be the way to look at it. If a certain coin is considered growing and is still low in price, huge growth in percentage is very much normal and expected. That is why it is quite common for us to see coins right now that acquire a 100% or even bigger growth. These are the cheaper yet promising coins. But when it grows big in value already, such huge growth in percentage cannot easily be reached. Say, the coin is already valued at $9,000, you cannot expect such coin to jump to $18,000 quickly.