CCDS will likely have a wider assortment of cylinders for rebreathers and sidemount config, ability fo fill O2 at higher pressures, will only charge you for the gas you use in rental bottles, plus helium.
EE will have better inventory if you need small bits, able to fill higher pressures of 32%, and fills will be included in cylinder rentals.
Regardless of which shop you decide to go to (why not both??), I'd recommend making a phone call to them and reserving the bottles you need before coming down here. That will give either shop the opportunity to pull stuff together for you and have it ready when you arrive.
EE will have better inventory if you need small bits, able to fill higher pressures of 32%, and fills will be included in cylinder rentals.
Regardless of which shop you decide to go to (why not both??), I'd recommend making a phone call to them and reserving the bottles you need before coming down here. That will give either shop the opportunity to pull stuff together for you and have it ready when you arrive.