If you're a hoops kind of person, you should look for jewelry with a wider fit to prevent them from feeling uncomfortable in your ear. Often, people only have one cartilage piercing, in which case you can layer up earrings. However, in order to layer effectively, you'll need to make sure all of your earrings are compatible. 

Additionally, flat-back earrings could create discomfort and even cause infection if you don't clean the area properly due to the style constantly pressing against your skin. As each area of the cartilage in your ear is different, not all earrings will suit all of them. For helix piercings, studs and thin hoops are a good choice. They won't rub your ear too much and are also ideal for layering. 

Because of where the helix is, you don't want to go too crazy with larger earrings either, as they will stick out and irritate your head and neck. As your helix piercing heals, it's best to stick to studs or simple earrings that won't cause any further irritation. The same goes for the forward helix. As this area is very close to your hair, you'll need to choose earrings carefully to avoid tangles.