I like my harp bow (although you cannot play on it ). The bow of crags looks... crap. Sorry, just like the ifrit bow which is kinda klunky. Garuda's bow (the one I started farming) at least looks decent and was the only primal weapon with skill speed increase.
Besides, in future update our zenith can become +2 and will probably beat the allagan at that time. What you need for it? Dunno, perhaps I do need to combine it with all primals weapons but untill that.. HARPY!