The blockchain and cryptocurrency industry is an industry that is constantly changing and evolving. So its hard to give you a binary answer inmy opinion. I honestly love both the projects.
However when I look at it from a larger perspective, I realize that the industry is rapidly changing and the top project maybe something we least expect. I see a lot of development happening in the Web3 ecosystem with respect to Polkadot. I see new projects like Concordium which are exploring new paradigms like Faas( Finality as a Service ) and are backed by years of Academic Research. DeFi is changing the way we know Finance.
If there is one thing we can learn from the industry, its that change is the only constant and BTC is King. It has always been.
Ofcourse Ethereum is very innovative, it is infact one of the most innovative projects out there, but BTC will continue to dominate unless Ethereum brings something so huge that it will lead mass adoption and will be seen a better store of value than BTC. Ethereum was never intended to be a store of value.
The truth is both Bitcoin and Ethereum has contributed a whole lot to the growth of the entire crypto space, on one hand, Bitcoin made the crypto space possible while on the other hand, Ethereum makes the further expansion of the crypto space possible. But irrespective of that, one of the wonderful features or attributes of Bitcoin is that, it is the most trusted and secured of all coins, now owing to the fact it is more trusted, in my own opinion makes it perfect as the best coin which will continue being on top. Yes Ethereum is decentralized, but not as decentralized and trusted like Bitcoin.
Therefore to attempt to answer the question, I do not think any other coin have the capability to overpower Bitcoin, not Ethereum or any other coin. Talking of most projects today, they are only driven by hype but Bitcoin is driven by a much higher purpose.