ETH and the BTC both are good and best coins in the market. This time the top coin is the Bitcoin and the other good ALT coin is the ETH coin becasue both coins have so much valuable and good and this time f we invest in both coins that is good for us and hold that just for 5 to 6 months and after that we saw good profit is present in our wallet and this is the best time to invest in it and hold.
Bitcoin and Ethereum each has a place they win but Bitcoin is just a coin that exist on it own, no other coin can compete with Bitcoin in any way and Ethereum also is the king of altcoins, there has not been any successful altcoins that comes closer to ethereum. Bitcoin has had competitors as the fork coins the way ethereum has had numerous of them but majority aren't successful.
Investment wisely, Bitcoin win over any other coin while Ethereum is also good option but Bitcoin win in all ramifications, the only advantage ethereum has over Bitcoin is because of Erc20 tokens but I guess BRC20 has settled that comparism.