AMD processors are more cost-efficient than Intel processors and are more suited for less resource-intensive tasks. Intel processors also are built with a smaller process size, which means more power can be squeezed into the same processor, compared to AMD.
Since AMD processors have a larger process size than Intel's, they have less raw power, but this also makes them cheaper. In less processor-intensive tasks, such as word processing, it is quite difficult to notice the difference in speed compared to Intel. In addition, using a cheaper processor means that the money saved can be shifted towards other priorities, such as more memory or a larger hard drive. Lower-end AMD chips also outperform Intel chips at the same price point. AMD chips are also more readily overclocked, which means extra power is accessible as long as power and cooling requirements are met.
Intel chips use less power than AMD, due to their smaller process size, so they are more suited for laptops and tablets, where power is at a premium. They also use less heat, which means less power must be spent cooling them. Intel chips also have superior power on the top end, which means intensive applications, such as games, function more smoothly. In addition, they are more suited to interface with high-end graphics cards.