Lets try this please. It may make a reuseable thread.
List a synth you know well and what you think the one or couple of functions (or sounds) it does best and sets it apart from the rest. I will start with an example.

Model: Alesis Andromeda (A6)
Best Feature: Fantastic LFO

The A6 Andromeda has an exceptional discrete triple stage LFO capable of extremely vast parameters. It far exceeds the capability of all LFO's on commonly known synths that I am aware of (w/exc. to multi stacked LFO on modulars beyond 3)

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