Bitcoin is totally useless as a currency because it’s slow, has high transaction fees, and easy to trace. So it’s bad for both regular consumers and criminals alike. Monero is a solid improvement because it has low fees (so far) and is very hard to trace. So it’s popular for criminals or intense privacy types. It’s still far too slow and hard to use to ever be accepted in your local grocery store. It’s also hard to b…
Bitcoin is the only cryptocurrency with guaranteed-not-to-change monetary policy and supply cap. That's because Bitcoin as a whole is uniquely hard to change.
Monero is great but easy to change and so not a reliable store of value.
Bitcoin and Monero need each other badly.