Samsung has now chosen official hardware partners by region.
Aeotec is The official partner for both the US and the EU/UK, so their “works as a smartthings hub“ is the current hub that you would get. Just get the right one for your region.
US:
Official announcement:
An Update Regarding our Hardware
SmartThings in a Hub-optional Configuration
BTW, if all you want is your dusk to dawn light, you don’t need a smartthings hub at all, as in fact the majority of smartthings customers now run without a hub. You only need the hub if you were going to use a Z wave or zigbee bulb.
If you were going to use a Wi-Fi bulb or one that has its own bridge like Phillips hue, then you don’t need the smartthings hub.
So in your particular case, you could just get the Phillips hue bridge, and use smartthings, and not need a SmartThings hub.
You could also use a Wi-Fi bulb like LIFX and not need a smartthings hub but still use the smartthings app and rules engine. 
You can do lots of things with a smartthings account in a hub optional configuration. All the same rules engine logic and the same app is available to you. You just need to choose Wi-Fi devices rather than zwave or zigbee. Or choose devices with their own bridge like Lutron or Phillips hue. So there are quite a few choices longterm if you do expand beyond that specific use case.