I got my pair of Nexus 6 dev phones a month after my iPhone 6 Plus.

The Nexus 6 reached it final OS update with N but the 6+ is about to get iOS 11.

The iPhone 5s is about to get iOS 11. If it weren't for the 64-bit transition I wouldn't be surprised if it had gotten on the iPhone 5 as well.

Apple gives about 5 years of iOS updates, which makes keeping the same phone a lot more feasible. Meanwhile my Google sourced Nexus barely makes it two without landing on security patches-only.