That said, I got myself a Moog Mother-32 recently, which is a hardware semi-modular synth, and I found it much more musical than software alternatives. I could immediately create much more musical pieces than I could with the software – even though I have MIDI peripherals for the software and the software can create any module I can imagine.
Another good option is SunVox; it's part modular synth, part tracker in a really cool UI. It includes a bunch of simple examples that demonstrate how to use the synth modules.
Back to the topic at hand. I've played with software gizmos, and recently picked up three secondhand units from the Korg Volca range. I'm not particularly musically talented, trying to change that over time, I find the physical controls way way way more intuitive.