Ricoh GR and Nikon Coolpix A features same type of APS-C sensor and ISO range + both camera doesn’t have OPLF (Optical low-pass filter), So you will get approx same image quality from both the camera.
Nikon Coolpix A features Image stabilization, on the other hand Ricoh GR offers you better display, more shutter range and light-weight body with affordable price tag.
Verdict: We recommend you Ricoh GR, Both camera features approx same specification, Nikon coolpix offers you Image stabilization but you have to pay approx $300 extra.
Buy Ricoh GR features B&H
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