ETHBTC is severely undervalued, based solely on the threat posed by quantum computing
Ethereum has a history of successfully upgrading the network while maintaining uptime, and will develop and implement a very high-consensus approach to deal with quantum-related issues before a critical threat emerges
but Bitcoin will spend months and probably years trying to deal with the quantum issue, debating soft vs hard fork, and any potential solution will then be piled onto by any number of special interests to make other changes to the protocol which will be objectionable to many
Bitcoin will likely enter a civil war over quantum
Ethereum has already spent months and years preparing for it
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