Unlike 2017's Galaxy S8 and S8+, there's a bit more differentiation between the Galaxy S9 and S9+. You'll see a secondary camera on the back, plus more RAM, and of course that larger screen and battery. That gives the Galaxy S9+ a bit better value proposition at its higher price, but may leave some who want the more compact Galaxy S9 feeling hard done.
Here are the complete spec sheets for the two phones.
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Category
Samsung Galaxy S9
Samsung Galaxy S9+
Operating system
Android 8.0 Oreo Samsung Experience 9.0
Android 8.0 Oreo Samsung Experience 9.0
Display
5.8-inch AMOLED, 2960x1440 (18.5:9)
6.2-inch AMOLED, 2960x1440 (18.5:9)
Processor
Snapdragon 845 or 10nm 64-bit Samsung Exynos
Snapdragon 845 or 10nm 64-bit Samsung Exynos
Storage
64GB
64GB
Expandable
microSD
microSD
RAM
4GB
6GB
Primary rear camera
12MP Super Speed Dual Pixel, OIS, f/1.5 or f/2.4
12MP Super Speed Dual Pixel, OIS, f/1.5 or f/2.4
Secondary rear camera
n/a
12MP, OIS, f/2.4
Front camera
8MP, f/1.7, auto focus
8MP, f/1.7, auto focus
Connectivity
Wi-Fi 802.11ac MIMO, 1.2Gbps (Cat-18) LTE, Bluetooth 5.0 LE ANT+, NFC, GPS, Glonass
Wi-Fi 802.11ac MIMO, 1.2 Gbps (Cat-18) LTE, Bluetooth 5.0 LE ANT+, NFC, GPS, Glonass