You're looking for a small computer to power a laser turret that can shoot multi-coloured balloons - it's a common situation we all find ourselves in at one point or another - and you've heard good things about both Arduino and Raspberry Pi.
The Cluster HAT interfaces a (Controller) Raspberry Pi with 4 Raspberry Pi Zeros (NOT included). Configured to use USB Gadget mode, it is an ideal tool for teaching, testing or simulating small scale clusters.
While building my Raspberry Pi retro gaming centre I ran into some problems with configuring game controllers. The challenges were straightforward. Would I use my Xbox 360 controller, or resort to a pair of basic USB controllers for two player gaming?