In terms of energy usage LED bulbs are the hands-down winner with much higher energy efficiency than halogen bulbs.
Led vs halogen spotlight. Halogen spotlights are usually larger bulkier and not quite as bright. You can pick up halogen spotlights for less than 1 particularly if you buy a multipack. Halogen can produce powerful light comparable to low wattage LED and lasts significantly longer than incandescent bulbs.
LED light bulbs are usually preferred over halogen lights because they last 10 times longer and consume up to 85 less energy. A halogen bulb works basically the same as an incandescent bulb. How To Tell The Difference Between Halogen And Led Downlights.
Because they operate at higher temperatures halogen bulbs have higher color temperatures and produce brighter light than incandescent bulbs. Halogen bulbs have a fragile quartz envelope and brittle filament wire. LED bulbs are more expensive but make up their cost over time by saving energy and preventing frequent lamp replacements.
Spotlights are generally used to illuminate a particular object such as a statue a doorway an interesting tree or an architectural feature on your home. That said halogen is still not quite as energy efficient as LED bulbs and generates significant heat. The difference is in heat emissions because more electricity is converted into light than with an incandescent bulb.
On the other hand while LED bulbs also produce heat it is drawn away from the bulb and dissipated by a heat sink which is one reason LED bulbs last much longer. Halogens redeeming features are its simplicity and its cost. You may also want to go with a spotlight if you want to contain the light to a specific area such as a small seating area without allowing the light to reach a neighbors window or to otherwise cause light pollution.
LED bulbs can use as much as 80 percent less energy than halogen bulbs. Again if you buy in multipacks youll save money plus its. Halogen vs LED.

