IPhone 5s 16Gb no space left?

So I have a 16GB 5S and I run out of storage a lot -.- and now I have to erase some of my apps music photo and videos. Should I buy a iPod 5 for music and games or sell my iPhone 5s 16GB for another iPhone 5s 32GB?

Sell the 16Gb and get the 32Gb one.