Hmm... The Packt Publishing POP book is good and actually it looks like they just came out with the Swift 3 version! I only have the Swift 2 version but it really compares the POP method with OOP and shows it's strengths and pitfalls.
https://www.amazon.com/gp/aw/d/1787129942/ref=mp_s_a_1_1?ie=...