Depends on who you ask I think. Emergentism makes more sense to me because if you take consciousness as humans experience it, make it derivative of material structure (neurological activity), and assume the appearance of some kind of uniformity as synthesis of different parts of that neurological system, the only way consciousness may exist in that framing is in organisms that posses a nervous system.
This does inevitably leads to the problem of where to draw the line on the complexity necessary to qualify as consciousness, and im.not gonna pretend like I have the answer to that, but at least it becomes more of a scientific question rather than purely philosophical I think.