That is not a reaction that happens. That is a summary of a set of reactions that happen, at (at least 2) different equilibria and different temperatures.
The direct reactions are as follows, at "steady state" solids if not specified:
$$\ce{2SiO_2 + SiC <-> 3SiO(g) + CO(g)}$$
$$\ce{SiO_2 + Si(l) <-> 2SiO(g)}$$
$$\ce{SiO(g) + SiC <-> Si(l) + CO(g)}$$
$$\ce{SiO(g) + 2C <-> SiC + CO(g)}$$
There is no reasonable answer to your question, because that reaction does not happen in a single step, it is not displacing anything. Though, the fact that you have to pour a spectacular number megawatts into the process for it to continue does suggest that $\ce{Si}$ is not "more reactive" though.