Hey there sweetheart. 13 is a wonderful age. The reason that I am responding is because I taught anatomy and physiology and you get one shot at life, so do things right and well. I am an old man and so I cannot say which one is best, but why a bra is important. If you are not properly supported upstairs, it can lead to back problems later on. Ladies with large breasts are miserable because their back has had enough abuse due to a poor fit. Price is a factor as better construction costs more to make. Narrow straps on larger breasts are a no no as the support is not there. Many ladies must have surgery to look better not look bigger because of tissue breaking down and then sagging. At your age is when you can start to avoiding problems. If you do not have a mom to help, do this. Go to the mall to a better department store and look for a lady who looks very nice and appears to have it all together. No one who has tattoos and body piercings, but dresses Proserpine. Ask her for an education and I think you might get special attention and good advice. Fully enjoy your youth and create good memories that you can share with your children. You are so special and the bible says that God says you are the apple of his eye. Isn't that great???