Matte finish means it’s even, smooth and doesn’t shine while dewy makeup gives the skin a light shine as if the skin is well moisturised.
Dewy makeup is best for dry skin while matte is excellent for oily skin. Matte look is achieved with matte foundation and powder. However for dry skin it is important to moisturise the face and let it sit for 15minutes before applying makeup.
You can achieve either of the two, dewy or matte makeup look, make sure to use the right moisturiser for your skin type.