Tires

There's no easy answer for that. This depends on the country you're in, if your main concern is traction, tire noise, wear resistance, tread life, wet weather resistance to hydro-planing, etc. Some car manufacturers install the cheapest tires they can buy in bulk, so anything will be an improvement. Some put on really high-quality tires, and some use low-quality tires from what are considered high-quality tire manufacturers.

Your best bet is to talk with the salespeople at the tire and alignment stores. They know the advantages of each brand and model, and what will suit your needs the best. Regardless of which one you choose, it is best to buy four new tires at the same time. That insures they all have the same rolling resistance, and the same traction for balanced stopping, front-to-rear.