Am I a better candidate for a upside down heart shape or round bubble but? (photos)

Your body frame is wider on the upper half and narrow in the lower half, and the photos of your goal are the opposite, it is unrealistic to expect a result like those photos as the surgery cannot make the hip bone much wider or reduce the size of the rib cage. You can expect a better balance on your body shape, by reducing the fat deposits on the abdomen, waist and back and getting the fat transferred to the buttocks and hip area, the goal will be to obtain as much roundness on your buttock and hips.

Based on the single photo posted, you have a "V" shaped buttock. This is the most challenging shape to correct. You do have lots of fat that can be used, but in your case, not all can be placed and expect to survive. You have small gluteus muscles, so it will not accept a lot of fat, and thin fat layer over them. You will need at least two sessions to correct this for you. Your underlying muscular and skeletal anatomy are not similar to your wish pictures. You will not get those results. See a board certified plastic surgeon experienced in advanced body sculpting techniques for an in person consultation/evaluation. Good luck.

You have to acknowledge that results are more related to your own body frame of bone and muscles  which will determine the shape and how much fat we may transfer, specially on certain areas where the muscle is not very thick, as is the bottom of the  butt. So creating a more curvaceous frame first, as a foundation, will be key in your case,  and that will be a smaller waist and wider hips. Dr. Cardenas