For whom how, but for me for a few years now the best coin among alts is ether, I think and this year it will be the best among alts.
It's a common answer to say etherereum will be the best performing altcoin but we must think another possibility as so many people were also aiming to get a lot ot return from their crypto investment. Just try to take a look at a bunch of coins from the middle tier are also getting huge increase at the same time with ethereum but it offers more than 100% increase instantly.
Invest in the major coin is a good decision but just remember if you can't make a lot of bucks forever from there. Middle market is much more preferable in this case.
everything can be changed, and giant can be worse. so, it is very possible Ethereum changes their position
But, what I see until now, Ethereum is still on track. it was developed well by their developers
beside that, it has so much gap with underneath (#3 rank). so, I don't wonder if many people still believe with this
as long as the dev still works well, I'd say that the best altcoin will still be Ethereum