What android phone should I buy? (also if I should switch to android in the first place)?

Recently, I have been interested in purchasing an android, coming from an iphone user. I would love the customizability, the higher quality scree, bigger battery etc. I was first wondering if it would be a good idea to switch. I want to, but I'm used to iMessage with my friends.

The three phones I had in mind were the Galaxy S6, the Galaxy Note 5, and the Nexus 6p. I'm mainly concerned with the note, and 6p size if it was too big. Although I like the large screen, would it be too big of a jump, I find that the iphone 6 screen is a bit too small for me. A bit bigger would feel good in my hand. Although I would like the big screen for netflix, would it be too much?

Final thing is, general specs. I just want a battery that will last me through the day. I am a pretty heavy user but I heard all these are fine for me. I also like the screen resolution, and overall features they offer.

Let me know what you recommend, or if there is another phone that might suit me.

Thanks

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