Crab +3 is currently better at the moment, but people have to understand that Accuracy & Attack trump all other stats currently. Once you see some stat balancing, and can really notice what you get out of the +3 DEX from Verdant, it may become the better bow. Especially if DEX ends up affecting Critical Hit Rating by a decent margin.

Edit:
Also, incoming: Materia. So this as well as stat balancing could change what we consider better right now.