To me, Greenbriar is a pleasant, barber-shop sort of scent with a pronounced green/herbal/soapy accord. It is long lasting on me. I wear it from time to time in the office or when I am out doing errands that might involve going to the hardware store (OK I admit it, I do not want to smell too foo-foo at Home Depot !
I sampled Newport at some point in the past, and did not care for it. It was probably the older formulation (check Basenotes). I thought it was a bit antiseptic smelling.