Progressions - as the frame of current experience, in tandem with natal, highlighting certain natal aspects, bringing them to the fore; esp. the progressed Moon is vital. But I have also seen the progressed angles, Vertex, Sun, Mercury and Venus and even Mars do their stuff
Transits - triggering experiences, indicating that the time for manifestation is NOW and probably also how it is manifesting.
Also I noticed in my own case, that the extreme deep experiences were happening, when the Transits mirrored my progressions exactly, and were connecting to them.
Example:
15th july 2013: 3:33 a.m.
secondary progressions:
pr Moon: 9 Cancer
pr DESC: 8 Cancer
n Pluto: 9 Libra
tertiary progressions:
tp ASC: 8 Cancer
tp Moon: 8 Capricorn
n Pluto: 9 Libra
Transits:
Tr ASC: 9 Cancer
Tr Moon: 10 Libra
Tr Pluto: 9 Capricorn
The time was simply ripe for Moon-Pluto.
Another day Iremember having had a most cathartic emotional experience:
secondary progressions:
pr ASC: 7 Capricorn
n Venus: 6 Capricorn
n Pluto: 9 Libra
Transits:
Tr Moon: 6 Cancer
Tr Venus: 5 Cancer
Tr Pluto: 7 Capricorn
another date, earlier this year, which was very improtant for me on an internal level
Secondary progressions:
sp ASC: 8 Cap
sp Moon: 5 Cancer
n Pluto: 9 Libra
n Venus: 6 Cap
Tertiary progressions:
tp ASC: 5 Cancer
Transits:
they weren´t close enough to trigger external events