Selecting the right type of tennis equipment will not make you the best tennis player in the world but it will give you a competitive edge. It is important to not follow the masses and purchase tennis equipment just solely on brand names. Just because your favorite tennis player uses a certain brand and model of racquets or shoes does not necessarily mean it will suit you.
An example of this is that tennis pros mainly use racquets that give them control. These kind of tennis racquets have smaller heads (smaller sweet spots), thinner and are heavier in weight. If you are a beginner starting out, you might want to use a racquet that is a bit lighter and that has a bigger head (bigger sweet spots). The sweet spot is the area of the string bed that produces the best combination of feel and power. This is useful especially if you are a beginner and don't generate enough swing power as compared to the pros.
Even for tennis shoes, don't go for the big brand names solely for the reason that your tennis idol uses it but ensure that they fit you perfectly and give you maximum comfort. After all, you will be on your feet all the time running around the court and you want to make sure that you find shoes that minimise the impact from all the running as tennis is a high impact sport.
Remember, selecting the right type of tennis equipment is solely based on your needs and requirements.