These concealers are two of the best i have tried thus far, however, i do have a favourite, particularly for hiding my under eye circles. As you can see the Studio Finish concealer is a thick, creamy consistency which i find works best when applied with your fingertips- allowing easy blending as the warmth will melt the initially dry solid state. For this reason i feel the studio finish has a greater lasting power and has better coverage due to being slightly thicker. The Prolongwear concealer on the other hand is a liquid consistency, which many people prefer for under the eye application, however, i find it difficult to get the coverage i want and when i layer it it can look quite, dare i say it, caky. I also find i need to apply it with a brush due to the runny consistency- something i find quite tedious to do, especially in the mornings. For this reason, i can declare the MAC Studio Finish to be the winner of the best under eye concealer (Its also 50p cheaper!)
MAC Studio Finish Concealer - £15.00
MAC Prolongwear Concealer - £15.50