any category is welcome although im curious about oscillators, digital or analogue, it makes no difference

Id have to agree on this one. I think my VCAs are the biggest value.
Yes, for me it's the Erica MIDI to Clock. Provides the clocks for everything in every patch.
People mostly seem to like LPGs because of the natural decay. If you ping it directly with a gate it will pass sound and then have a short decay, whereas if you ping a VCA it will just be on/off like tapping a key on an organ. You an approximate the same thing with a VCA/VCF combo