Give me any ethereum use-case & I'll tell you how to do it with bitcoin.
Is it advantageous if a DSL is turing complete? It is not that bitcoin 'cannot have' a turing complete script but that it is unsafe & there is no need to do so. Turing completeness can be applied on an upper abstraction.
There is nothing that ethereum can do that bitcoin cannot! The proof of it is RootStock which is ethereum implementation using bitcoin.
Ethereum is full of buzzwords and the key one of them is DApps. Here [0] is how to build a dapp using bitcoin. Basically you can tell me any application of ethereum and I'll tell you how you can do it with bitcoin. Skynet type input requiring applications can't be done inherently by either ether or bitcoin but can be done by both using third-party oracles.
Then are bitcoin & ethereum equivalent. No, they key is origin of money. Bitcoin is mined, ether was sold.
The recent rise in price has attracted all kinds of attention but talk to any of the core-devs and they'll tell you that Vitalik used to come up with complicated explanations which they spent time studying and responding & then he'd come back with something even more complicated until they stopped caring.
[0] http://startupboy.com/2014/03/09/the-bitcoin-model-for-crowd...