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Broadly, keyboards are divided into two types:
1) Synths/keyboards/workstations/pianos, all which actually make sounds themselves;
2) MIDI controllers, which make no sounds and require being plugged into a computer or a sound-module (synth box without keys).
The minilab is an example of the latter, being a MIDI controller which comes with a cut-down version of Arturia Analog Lab. Install Analog Lab on your computer, connect the MiniLab via a USB cable, and away you go.
The Microbrute is an example of the former: it's a synthesizer in its own right, and does not need to be rigged-up to any other hardware (other than amp/speakers) to make sounds. Though like most instruments in category 1), it can still be used as MIDI controller if you desire, though that's a bit of a waste if that's all you are going to do with it, plus you'd be paying for functionality you don't need.
Have a think and report back.