In mobile communication multiple-input multiple-output (MIMO) systems, angle estimates are invaluable for positioning, initial beam acquisition and interference mitigation. In the context of true-time delay (TTD) systems, angle estimates can be obtained by established signal processing routines at the receiver. Similar signal processing approaches are applicable to frequency diverse array (FDA) systems. However, real-world implementations suffer from hardware impairments such as sample-time-offset (STO) and carrier frequency offset (CFO), which can degrade estimation accuracy.This work compares TTD and FDA arrays in regards of their resilience to STO and CFO impairments using the root mean square error (RMSE) of angle estimates as metric. Furthermore, the impact of implementing the time/frequency shifts in base-/pass-band is examined. The investigation shows that even under typical STO and CFO impairments, estimation errors of 1° can be achieved at 0 dB signal-to-noise ratio (SNR), highlighting the robustness of these techniques.