I learned with the RWS (only available deck in those days) and when more decks came out in the '70's I had a many-years marriage with the Aquarian, a torrid long-time affair with the Morgan Greer and a deeply significant relationship over several years with the Hanson-Roberts. The Morgan's tarot became my private play-pal for a few years in there, too.
The Robin Wood took everything over for many years, I wore out several copies. It only shared the lime-light with the Mythic, which gave me an easy way to do depth readings. It taught me more, I think, than all the others. Went through a couple of those, too. The last great passion was with the Courtney Davis celtic deck, that I loved so much I learned to read pips for---no small thing.
I don't really read with any of those anymore. It's the oddest thing, I have all of them, but it's like they're historic relics, not meant for my use anymore. I can do it, but it feels stale.
Except the Mythic. I think it's time to re-up the Mythic, read the the companion book again, cleanse the cards, and see what's happening. I don't really have a "One True Deck" right now, but I use the Buckland Romani, the Druidcraft and the Revelations a great deal in reading for myself and others. I think the Mythic will join (re-join?) that group. I am defiantly open for another grand Passion