I’ve just published a demo video of the Sequential Pro 3 with presets for Ambient, Electronica, and Techno. Maybe you find it interesting.
And if you even consider purchasing this pack, you can get a “25%-Elektronauts-Booo-Spam-sucks” discount by entering the promo code “TRITON” during checkout.
I’ve got several, but the following have accompanied me for quite a while, now:
Sequential OB6 & Matrix 1000 (love that Oberheim Sound)
AS Semblance (stored away, but that one had been an essential part of my studio for years for its incredibly melancholic and smooth sound)
Twisted Electrons MEGAfm (great for OldSchool Dub Techno) and TWISTfm
Roland SH-101 (and its many clones SH-01a, Donner L1 Essentials, S1 - not so much the Behringer MS1, though)
Nord Modular
intellijel Cascadia (mainly for its excellent user interface, sound is also great but not super unique)
Dreadbox Artemis as a modern sounding allrounder
I also like quite a lot of other synths, but in my best-of-list, I’d include mostly synths that I could not replace easily with other models, for different reasons.