Definitely opt for the triangle shape, it is the most natural shape and it fills the bra very well. I have tried many shapes and sizes over my many purge cycles. Several years ago it was very expensive now with sites like Amazon it is more affordable. I have however noticed that it is better to go for a larger breast size than the desired bra cup. For example, choose a size DD (1200g) or even E (1400g) for a D cup bra. I like it when the fabric of the bra cup is tight and doesn’t wrinkle. Finally when it comes to the weight, it’s probably the most pleasurable feeling to feel tension on the bra straps and a wonderful feeling of fullness on the chest. Also personally I prefer the 1400g (E) breast forms. They bounce more when you walk in high heels.