New phone

Hello.
I am looking for a new phone. I reviewed a lot of devices, but I can't make a decision. My favourites are Samsung Galaxy A5 (2016), LG Nexus 5X and Samsung Galaxy S6. I would mostly like that phone and applications works smoothly, without lags, and I want good photos. Which of the three phones mentioned above do you recommend? You can also suggest a new phone in that price range (at most 400 € approximately).

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