With them being so similar, would you rather buy a Galaxy S8, or a Galaxy S9?
That's not to say that the S9 duo doesn't add some cool stuff. The stereo speakers are a very welcome new feature, the S9+'s secondary camera is definitely nice to have, together with the Portrait Mode (Live Focus) it brings, and a slight bump in hardware is always good. There's also the experimental blood pressure sensor, which is... you know — cool, but experimental.
With Sammy's flagships now sitting comfortably at a starting price above the $700 mark, we do believe that a lot of people would rather go for last year's flagships than cough up the dough for a new phone that doesn't really look all that new.
So, would you go for a new S9 (S9+), or are you more likely to look for a shiny, yet cheaper S8 (S8+)?