CoolSculpting & TruSculpt are both modalities to treat fat.
CoolSculpting uses cyrolipolysis, which uses cold temperatures to freeze the fat, killing and permanently reducing the fat cells. It is a reliable, consistant and effective method of permanently reducing fat cells - but you must have a distinct buldge in order to have the treatment done.
TruSculpt, which uses radiofrequency and comfortable heat and can treat anywhere from the shoulders down. Trusculpt causes a "natural" cell death and results are seen in 4-6 weeks. Everyone is a candidate for TruSculpt as there is no "pinch rule" or need to have enough skin/fat to suck up into a handpiece.