The FRS/BRZ are great sports cars for budgets under $28k. They should be be in the same class as the Miata (RWD and same performance).
IMO the 370z is in a different class of cars than the FRS/BRZ.
Comparing the FRS/BRZ to a 370Z is like comparing the 370Z to a C6 Vette. Different classes all together.
I think the Genesis Coupe 3.8 R-Spec is more comparable to the Z. But thats just my opinion.