I have used motorola, samsung, sony, lg but iphone is different because iphone does have some unique features like as you the 3d touch.
No phone have that feature this feature makes easy everything easy show any information like whatsapp videos just touch with 3d touch and video automatically play without open it.
Iphone have 240fps recording feature but other phone have that feature in high end phones that not smoother like iphone 6 have.
I love feature like. Slow motion a good camera , high end processor, good display quality, ios interfac and also the build quality.