According to the principle of blockhain, the more transaction that is verified and confirmed, the more secure it will be.
We all know that Bicoin starts several ago and undeniably the most secure platform up to date as long as the principle is concerned but Ethereum has more capabilities than bitcoin and we all know that most of the coins that are emerging is an ERC20 type of coin which uses Ethereum platform.
In your mind, which platform will have more transactions and therefore secure in the future.
Keep in mind that Ethereum starts 3 years ago while Bitcoin starts 9 years ago. Also consider the fact that Ethereum can handle more transaction per second than bitcoin.
First the bitcoin doesnt have any good working platform which is why i am going to expect more to ethereum,second erc20 tokens arent too reliable these days as most of these new ICOs are scams,these people are using the disadvantages of ethereum's platform to scam a lot of people giving them millions in an instant.