We present a comparative study of electrical transport properties in the normal state and in the dissipative superconducting state between pure $$\beta $$ β -FeSe phase and Fe deficient Fe $$_{1-y}$$ 1 - y Se crystals. We discuss the influence of the intergrowth of the magnetic hexagonal phase (Fe $$_7$$ 7 Se $$_8$$ 8 ) in Fe deficient samples when compared to pure $$\beta $$ β -FeSe samples. In the superconducting state, we measured the $$ab$$ a b -plane electrical resistivity with magnetic field up to 16 T and the electrical resistivity as a function of the angle between the $$c$$ c axis and the applied field. The angular dependence at fixed temperature below the superconducting critical temperature, $$T_c(H=0)$$ T c ( H = 0 ) , is very different for both sets of crystals. The Fe deficient samples display a vortex pinning-related feature at $$\sim $$ ∼ 57 $$^\circ $$ ∘ off the plane while the pure $$\beta $$ β -FeSe phase samples show the persistence of a strong angular-dependent magnetoresistance characteristic of the normal state electronic structure.