S6, because last year`s S5 can`t make calls or sit on facebook as good as this one, but hell yeah .. it was better than S4 because it could show facebook in fullHD unlike S3 ...
You say less pixels and more battery ? Are you by any chance insane ? And we know we laughed at iPhone for not having an SD card, now the joke`s on us!
When will people understand that they don`t need a new phone every year.
Switching phones every year may not be ideal, but switching flagship phones every 2 years, is quite economical if you do not care about being in a contract for a cell phone.
The way I look at is, I have purchased a new flagship phone for $199, in 2 years I can still sell my phone for $300+ on ebay or craigslist, I make my 200 dollars back and buy another phone under contract. Now that plans are cheaper when buying a phone outright or not being under contract I have stopped doing this strategy, but if you do not care to be under contract, in theory you can buy a phone without ever spending extra money if you don't count the extra contract fee.