Meguiars is much better. The wax you got is a type of cleaner wax. It removes particles off the paint surface and also waxes the car. Frequent use of cleaner wax is not recommended and should be used once in 2/3 months. For weekly applications, use wax only.
Also for better results, wax consecutively on two days i.e. wax the car on saturday and then on sunday get the car washed (without shampoo/surf/anything) and then get it waxed again. For best results, after second application of wax(on the the second day), apply a top coat. Top coat is used to provide the car a glossy like finish, most commonly used in car shows etc