I do BYOP because I like Nexus devices.
For my wife we did lease. It makes sense. It is the same thing as easy pay, just cheaper monthly payments really. After 2 years I just keep paying until paid off, or trade in.
But, she keeps phones for a while. She has an S6, and after two years that phone will not be worth $200. Just look at the S5. I can pick one up for $200 easy and it is only 1.5yrs old.
Lease is best cause she does like to upgrade, and this way we don't have to pay full price for the phone or have to deal with selling it.