Citizen has different versions 1212, 1812,1818. They are all great cobs. Citizen does have the advantage price wise and for what ever reason (spectrum) I have done much better with citizen. I have also taken par readings with most cobs and what's on paper is a bit different than my meter reads. I say in real life applications it's much closer than what's calculated.
As for the driver it probably wouldn't be the best choice as the cob holders have voltage limits. When running so many cobs in series you'll quickly go over them.