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Nanmu wins in overall sculpt and paint fidelity, plus you get semi-translucent teeth.
The only place W-Dragon edges them out is on their female sculpt; she's a bit more accurate in shape to the JP1 Rexy, if that's what you're after.
Nanmu's female isn't as accurate to Rexy, but depending on light conditions and whether you close the mouth (the middle-left photo), she may be able to pass.
W-Dragon's male, I wouldn't touch with a ten-foot pole.