The removeable battery and SD card slot alone on phones are not deal makers or breakers for me. It's more involved then just those things.
I can understand why others prefer them though.My sister being one of those who prefers them.
Not really. Although I prefer them, most can live with a 128gb internal option of the s6, and on the rare occasion where charge isn't enough, I can use a battery pack
Sent from my Pearly White Verizon Samsung Galaxy S6 Edge