Need opinions on 16GB 6s

[I Need a Drink]

My father is going to switch from a Android to the 6s. He doesn't listen to music on his phone, doesn't need to store any videos and I'm going to setup iCloud Photo Library for his pictures. I was thinking about just setting him up with a 16GB 6s as it's the same price as the Galaxy S 6 that he was considering and he asked why he would need to pay another $100 for more space. No installment plans are available as we have a Business Plan so we have to buy phones on 2 year contracts. With photos being saved in the cloud and he won't need space for music and videos, is there any reason, other that it's BS that the base model is still 16GB, that he would need the extra storage?