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.

Hello dear!
Thanks for the pictures and provided information as well.
Based on your photos, you are a great candidate for liposuction with a BBL and a tummy tuck, to give you a nice tight tummy and to get rid of the extra skin, and I think you'll get very good results.
Liposuction allows your plastic surgeon to transform your entire shape. You can improve your waist, back and flanks, and of course your buttock, to give you a beautiful heart shape, along with the tummy tuck.
In general, you need to be physically healthy and at a stable weight, have realistic expectations, be a non-smoker and your BMI needs to be 33 or less.
l recommend you to make an appointment with a board certified plastic surgeon to talk about your goals and anything you need to know.
Good luck :)

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.