SokoGreat question! That SEED Drop consists of an Arduino board which is very different from this Raspberry Pi3 Drop. That drop is selling the Arduino boards which are used mainly for programming and connecting accessories like the ones that come in the kit like led and motors. But this drop is selling Raspberry Pi 3 boards which is more like a mini computer and has a similar interface like Linux and can be used for low demanding applications like web browsing, office (documents, power-point, excel) and also can play movies via KODI. This drop also consists of a LCD screen which can be used as a mini monitor instead of plugging your raspberry pi 3 into a monitor. A cool thing to know is this one comes with built in WIFI, which is very convenient rather than having a messy wired internet connection. To sum it up I would choose the Raspberry Pi 3 over the SEED drop cause you will more likely enjoy playing around with this kit even though it is quite pricey.
AABBIISSHHEEKKI decided to buy this one because some of my friends at massdrop are saying your job is in jeopardy. I hope this is enough to keep you in business another month.