War bows have no good uniques.
Huntring bows are quite good on the other hand.
The fact that there are very nice unique hunting bows doesn't make the unique war bows bad.
Cloudpiercer (rending + jolting touch), Sabra Marie (confusing), Rain of Godagh Field (speed) and Borresaine (draining, stunning) ar all very good in my opinion. Ok - I also always go for Stormcaller of Persistence, but still...
Stormcaller is very good for building focus because of the -6 shock DR. I would choose it for my bow cipher - if had no ranger in the party of course.
If you have more than one cipher, sure war bow might be an option.