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Pro Straightforward device pairing by scanning barcodes of supported devices
SmartThings makes it very easy to add new products - it's as easy as scanning a barcode instead of typing in a code.
Pro 'Robots' is a feature that lets you configure custom events and actions
You can use 'robots' to automate your system. Robots can be anything from neat tricks - flashing lights when you get a text - to more functional events such as locking your doors when you leave for work.
Pro Does not need to be tethered
The hub can be put anywhere in your house so long as it's powered and within range of you router. You don't need it to be tethered to your router.
Con Automation scheme setup could be a bit more straightforward
Con Robot actions can be especially laggy as they are routed through the cloud
Robot actions would be much quicker to react if the robot code was stored locally, and you wouldn't have to rely on the internet as much.