It depends on the size of the phone that you want. The iPhone 6S is significantly larger and also has the 3D touch technology. However, if you are looking for a design which was quite widely accepted around the world, the SE would be the one for you. Both the phones are equally powerful and the rear camera on both the phones is also the same. The iPhone 6S, however, has a superior quality front-facing camera. The iPhone SE also carries a lower price tag.