From a scientific point of view, I don’t think there is much of a mystery as to the origin of consciousness. It is understood to be a product of the brain. The origin of consciousness is already roughly understood from the evolutionary and developmental points of view. We know that somewhere between a single celled zygote and a conscious human there are developmental pathways that build the brain and produce consciousness. From the evolutionary point of view, we know that the mutations that separate us from non-sentient species or non-conscious species are the mutations that explain consciousness. All that is left to do is figure out specifically how those developmental pathways work and which specific mutations are important. Figuring out these details is going to take a ton of effort, and as the old adage goes, the juice may not be worth the squeeze.
The origin of life is a much bigger mystery. It’s not as if we see base chemicals combining and producing life all of the time like we do with embryonic development and conscious humans. We still don’t have a strong idea of where to even start with abiogenesis.
Which is harder to tackle? Depends on how you define “harder”. Consciousness is an easy task from a theoretical point of view, but much harder from a technical aspect. Abiogenesis is a much harder task from a theoretical point of view, but would easier from a technical aspect once the theory is hashed out.