Ethereum isn't even a worthy opponent against Bitcoin.
Ethereum is just a token that facilitates other tokens to use their network, there will be a time the Layer 2 overtake Ethereum position. In the past Polygon and Ton coin have potential to beat them, but now it's turn for Solana.
Ethereum can't be the boss because they're centralized.
No coin is a worthy opponent to Bitcoin except for Monero. The other PoW coins are at best satellites orbiting around Bitcoin, eg. Litecoin and Doge. Smart Contract chains like Ethereum and Solana serve a completely different purpose (DeFi) and the rest are shitcoins.
Monero is the only thing that even comes close to scalable private money like Bitcoin. Unfortunately, it's being hamstrung by regulators.