I often use the Waite deck, but I have also started using the new Watcher Angel deck. That deck actually translated really well compared to other decks I have used in the past.
I like my first best, Waite-Albano. I also like the Olympus and Thoth decks. The Visconti is interesting too. I have seen the Motherpeace though not a deck I own.
Blessings and happy shuffling
I'm using the Sasha Fenton deck. It's the only deck I've ever owned and I find that I have an eerily good success rate with them.
My goodness, let's see. I have the following decks:
Ancient Italian tarot
Silver Bohemian Gothic Tarot
Artist's Inner Vision Tarot
Deviant Moon Tarot
Modern Medieval Tarot
Tarot of Atlantis
Universal Fantasy Tarot
Manara Erotic Tarot
I also have two oracle decks
Graven Images Oracle (you can go here and get a free online reading - http://www.gravenimagesoracle.com/)
I don't read tarot for myself. I have my cards read once or twice a year at various Faires. I use the Oracle decks for myself if I feel the need. I use the tarot decks just for meditation and spellwork but occasionally, the cards speak to me. I'm not looking to them for answer, but the universe, apparently exasperated, gives it to me anyway.
I want to get the Mary-El Tarot when it gets released http://www.mary-el.com/
And maybe the Alice (in Wonderland) Tarot http://www.alicetarot.com/