The Nikon Z8 dominates in resolution, autofocus, and video per RTINGS and DPReview tests, making it the clear choice for demanding work. The Ricoh GR III wins on portability with its 257g weight versus the Z8's 820g, ideal for discreet shooting as noted in user reports on DPReview. This is not a close call given the Z8's 9 verdict score over the GR III's 6.