This depends on your home and how you want to use it. Track lighting is a great option if you want a lot of versatility because track spotlights can be positioned on the track and turned where you want. If you do not need as much versatility, a regular directional spotlight will let you direct the light where you want.
If you have something to highlight, like a piece of art or interesting architectural features in your home, use a directional spotlight for emphasis. They can also be used to direct light into darker areas of your home. Many directional spotlights can be installed on the wall or ceiling, making them very versatile.
If you are looking to replace a bulb on an existing light, make sure it has the correct amount of watts for the fixture. If you are shopping for new directional spotlights, you have a number of light bulb options.
Halogen lights are very popular in directional spotlights because they produce a lot of direct light without using a lot of energy. They get very hot when in use, so they are best when used away from curtains, carpets or other flammable materials, making them great for use in directional spotlights.
Traditional incandescent bulbs and energy-efficient LED bulbs are sometimes used in spotlights. Your choice will depend on the amount of light output you want and how much energy efficiency you want.