why use same type of bows for ranger spike

why do you have to use the same type of bows for a ranger spike group? ex: long bows, short bow, horn, etc

Delivery time

different bows have different shooting time?

i think different bows hav different range. dont take my word for it.

Bow types listing:
http://www.guildwarsguru.com/content...ies-id1092.php

Hmmm......In your guys opinion which is the best balanced bow for both pve and pvp

each bow has it's uses... there is no "balanced bow"...

personally... i like to carry a halfmoon, stormbow, eternalbow, and a mursaat hornbow... halfmoon for when they get close range... stormbow for pulling/starting off the battle... eternalbow for interupting... and mursaat hornbow for QS builds and such