I've got the 128 GB iPhone 7, with 121.97 GB actual capacity. Got 16 videos, almost 500 photos, 86 apps with still 96.33 GB left. I mean, that's crazy. It's a lot storage, a whole lot. Can't even think of a way to completely fill it. With my 64 GB 6s I had around 20 GB left with almost 150 apps on it (though with less videos).
But I'm really happy I've chosen the 128 GB model. 32 GB would've been enough, but then I would constantly be checking how much I have left to install more apps. Did not have that with 64 GB, let out that I'm gonna have that with the 128 GB iPhone 7. 😛