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Indeed the adoption of Ethereum is much higher than Bitcoin. The basic thing is that the price level is still low compared to Bitcoin. But to reach the Bitcoin popularity level, I think it's something very difficult. Apart from that, the amount of Ethereum is more than Bitcoin, so the spread of Ethereum in various wallets is much higher than Bitcoin. Transaction fees are also something to consider.
it really doesn't matter which price is more expensive or cheaper, but ethereum does have technology that can be used easily and cheaply by other projects in its chain. this is very helpful for new projects that are minimally funded to start, and we see that there are many projects that were initially built on the eth network, then succeeded and eventually built their own chain. besides the popularity of ethereum also contributed to the success of the project. with a real and active team developing the technology, so it's only natural that ethereum and its tokens cater to the crypto ecosystem. while Bitcoin has no focus there.