Unlike a PC, phones have certain things they need to do well. For those that want to game on a phone then it's not just the CPU but the GPU so there's no best here. Just a lot of choices.
Did you want CNET's iPhone 6s plus review? It seems to be about the best I've seen to date.
http://www.cnet.com/products/apple-iphone-6s-plus/
Hello guys, I just wanna ask some questions. What is the best phone processor today? And does it affect the battery life span? thanks.

Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic