I have a 16GB iPhone 6 with 16 games on it. Some of those are Vainglory, Crashlands, Quadropus Rampage, Heroes and Castles 2, Dust: AET, Geometry Wars 3, Horizon Chase, Ire, and Wayward Souls. Also have like 1GB of music stored which is like 100 songs or so.
Also have a 32GB iPad Air. I use my iPad for Vainglory, XCOM, Telltale games, and games where the bigger screen is more beneficial. Don't have any music or anything on iPad. It's strictly for gaming.
I have a 128 gig iPhone and a 128 gig iPad, both packed to capacity with games, movies, music, apps photos etc. I realized not long ago that I could probably fill a 1TB iPhone if they came out with one lol.