1. Platinum- has the foundation of SPs (Cyrus's Conspiracy, Poke-Turn, etc.) with more playable rares than RR over-all (Blaziken, Ampharos, Blissey, Banette, Shaymin, etc.).
2. Stormfront- the origin of brokenness IMO (Gengar, Machamp) and has a large number of decent and playable cards (Salamence, Dusknoir, Magnezone, Raichu, Cherrim, Gyarados, Scizor, Tangrowth, Bibarel, Sableye, etc).
3. Secret Wonders- nice cards in Furret, Corsola, Smeargle, Stantler, Gardevoir, and Gallade, as well as Roseanne's Research, and reprints of Bebe's Search and Night Maintenance.
4. Legends Awakened- the pixies are revolutionary, as well as Kingdra, Mewtwo LV. X. Has some decent cards like the TMs, Buck's Training, Cynthia's Feelings, etc.
5. Great Encounters- aside from Claydol, Pachirisu, Sceptile, and Unown G, I don't think that there are that much playable cards; still, its better than MT and DP.