I tried both methods of propagation last year with my Targets and Challengers. Only one of the six cuttings took, whereas all four buried bines gave viable plants. Also, I've noticed this year that the plants that were grown from buried bines are much more advanced than the single plant that was grown from a cutting. I presume that's because their root systems are much more advanced. Still, all new hop plants are good, so if cuttings work for you, that's all that matters.
Bottle conditioning: Pliny the Elder clone; Tramp's Overcoat Barley Wine
Next up: Vanilla Porter