So you're running them bro? It looks like they're available in both 310 and 320 mm, which one did you go with and what's the difference between the 2?
all else equal, bigger brake disc is better. For the same clamping force produced at the caliper, the braking torque at the disc is higher, hence the performance increase without any disadvantage at the user level: same force at the lever, same temperature of the hydraulic fluid. Furthermore, you get more feeling and better control of the stopping.
However, a bigger disc has more moment of inertia (slightly different steering feel) and it's structurally weaker, because the bolting point remain at the same circle on the rim.
One could argue that the difference between 310 and 320 mm is academic at just a little bit more than 3%, but everything adds up.