Huawei P9 vs. LG G5 vs. Samsung S6

Hello,
Im really struggling to choose which phone to buy. Im thinking about P9, G5 or S6. Or maybe you now something better than these with similar price.
I now that S6 is much older, but its in similar price range .
I watched many comparison videos(mainly LG G5 vs. P9), but still cant make my mind.

As every user, I need stable, not lagging phone(samsung rules out? ). I think they all will run pretty much the same, but which will lag least and work most fluidly(custom roms does...

Huawei P9 vs. LG G5 vs. Samsung S6

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