Out of the box the Boost runs you through the base models with some build-specific commands. We've been through most of those builds. They also have some bases

Out of the box the Boost runs you through the base models with some build-specific commands. We've been through most of those builds. They also have some bases for building your own creations, and they have completely free-form programming. (Scroll to the right and tap on the swirly looking thing in a window - it's not particularly discoverable, but kids are surprisingly good at exploring all the corners of UIs.) They've also added some builds that combine other modern lego sets with boost. I wasn't aware of WeDo, or I would have taken a look at it. I was looking for something to motorize legos and to expose my five year old to programming (if he was interested) and mindstorms seemed too complex/expensive. It looks like boost may have more motors than WeDo (and the motors can be used as rotation sensors), 800 lego parts, some pre-designed builds (he's enjoyed the robot, cat, and truck thing). However, the "control hub" is a bit bigger on Boost (it contains two of the motors), which effects the size of things you build with it. I probably would have still chosen Boost if I'd known about WeDo.