What is the best option for 6 months investment . BTC , ETH and Other Coins going price up continuously. What do think,which coin is good to Hold 6 months ?
Bitcoin has always been increasing much more than ethereum and the other altcoins, with other "altcoins" i think that you mean about Monero, Litecoin, Dash, Ripple, and so on.
But the price in bitcoins of those alts has been much more higher before, and this is why you are probably lossing a lot of money if you bought those altcoins at the moment.
As an example, if you hadn't bought ethereum on July, now you could have 0.12 btc per each eth (more than $2200)