Don't really like any of them, but If I had to choose, I'd go for hb. Why? IL was a hawk eye chronicle. There was no balance what so ever. Also there were no fortress sieges in IL, c4 style oly, no kamaels, no hb island and etc.

lol its almost thesame, only hellbound island and elemental stones added, and stupid kamaels

Well c4 for me was the top that nc could make..

IL without bugs and some functions its cool too...

 

lol some wrongs on this topic...!!! well old school is c4 xd not c6

hellbound is really sh1t and when it comes out after 3-4 month dont remember it was already old his place took gracia...

but i still see c6 servers so i vote c6