In terms of performance and handling all the variants of one model remains same. The difference comes in terms of feature, comfort and safety system. Therefore based out on individual requirement, one should choose which model to go for. The complete feature list of Swift is available which you may refer for reference. The tire size and brakes are efficient on the Maruti Swift ZDI / Maruti Swift ZXI version as it comes with brake booster but its slightly pricey for budget hatch.