I’d shoot the duck for the 15 in that case. It’s more future proof, especially with USB C.

Original, white 3G, Black 3GS, black 4, white 4s, black 5, gold 5s, gold 6, rose gold 6s, jet black 7, product red 8, black X, gold XS, Midnight green 11 pro max, pacific blue 12 pro, sierra blue 13 pro, space grey 14 pro, blue titanium 15 pro

I’ve done it and it saved me a lot of headache. I had so many apps I wasn’t even using and it was very nice to have a nice and clean app layout