Difference between my OLD DB and making a new one after chaos?

So i have not played in 6-7 months or so.. or whenever the release of db's was, my DB is level 39 and ive recently returned to play Maplestory. i wanna know if i should Continue my Old, Before "chaos" db, or make a new one. can anyone tell me the differences, pros and cons, and things i need to know. Thanks