The C-Class and the CLA-Class are two very different cars so it all depends on what's important to you. Some major differences: FWD/RWD. Yes, both will have 4MATIC options but the CLA will be FWD until there's slipping. C will be RWD until slipping. The CLA will have much better fuel economy. Since this will be your daily driver, depending on your commute this may be a huge factor. Size. The C will have a much more comfortable back seat. If it's just going to be you and your wife in the car most of the time then having a small back seat isn't a factor. But if you plan to shuttle people around (adults) often then the C will be better. Price. The '15 C will cost a lot more than a CLA when equally equipped. If you're looking for uniqueness then it's the CLA hands down. The C-Class is like the Camry of Mercedes. There's tons of them around and yours will just get lost in the mix.