Both ACG and CND Shellac are excellent gel polishes, each with unique qualities - CND Shellac is easy to remove, hypoallergenic, but requires its own traditional UV lamp. ACG has great fashion forward colors and cures in LED, plus you already have a relationship with the vendor. That said, if you are venturing into the world of gel polish for the first time and it will be your only one, at least for a while, I'd have to say go with CND Shellac. CND has the market penetration, customer support and name recognition that brings in customers. People walk in looking for Shellac. Although ACG is a fantastic product, I think selling customers on ACG, versus Shellac is an uphill battle.