Well, HB is almost the last L2OFF version able to run being decent and with updates, gracia/freya are only running on l2j that make them not so close to retail.
HB have more balanced olympiad system (since Olys is no more a PP/OL/Duelist paradise) daggers are now a factor in olympiad becasue of dw and attributes, enchant system for skills is more complex, kamalols are not yet so op on HB chronicle...and client is pretty..
Btw i was allways an IL defensor, but from far i see lot of IL servers incoming with the same features and I see ppl a bit bored, IL have a very limited gameplay, you reach lvl 80, make S grade that is easy and there are nothing more to do, pvp is all about archers and daggers....
well its difficoult..