Bitcoin is the strongest one and ethereum is the most usable one. I think ethereum is way better than bitcoin because everything abotu ethereum is better than btc. Transactions Speed ERC20 tokens webwallets etc etc etc. But also i trust bitcoin in the same time. But it is clear ethereum will be more profitable than bitcoin in the future because ethereum is altcoin. I saw something in Telegram. That text says you have to buy and hold at least 1 bitcoin and after that you can use your money whatever you want in altcoins. That is very true. I am holding 1 btc and i am continue ethereum.