You are asking for a huge debate.
This topic has been discussed many times. So don't get discouraged if a lot of people don't reply.
Instead, try doing a search on DSB(LS) and CC, you will find some really indepth debates.
My opinion, both work, both have plus and minus.
I use CC in maintank, but am going to set up a refugium with DSB. Best of both worlds I guess.
Changing over is a big ordeal, go with what works. If you really want DSB then go for it, but be prepared for a lot of work.
Thats all...........MCF