I dono, they both are about the same to me.
Anyway here's a full list it's still missing who are REVs and who are Uniques.
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CONFIRMED CHARACTERS (14 REV, 6 Starter Uniques, 6 Unique, 8 LE):
Batman #1 (standing - black cape) (Starter) (Dark Knight Detective LE - standing - blue cape - Wizard/toyfare/inquest magazine Mail-away)
Robin #1 (Starter) (D*ck Grayson)
Hawkgirl (Starter) (Shira Hall)
Joker #1 (Tipping hand) (Starter)
Harley Quinn (Pop Gun) (Starter)
Man-Bat (Starter)
Scarecrow (Dr. Jonathan Crane LE)
Beast Boy/Changling (Gar Logan LE)
Robin #2 (Tim Drake) (Tim Drake LE)
Cheetah (Debbie Domaine) (WW AE?) (Barbara Ann Minerva LE)
Blackfire (Starfire AE) (Princess Komand'r LE)
Starfire (Blackfire AE) (Princess Korriand'r LE)
Aquaman (water-bearer)
Raven
Wonder Woman (Cheetah AE?)
Bizarro
Joker #2 (Killing Joke) (Batman AE)
Batman #2 (Gargoyle) (promo giveaway at Free Comic Day - May 7th) (Joker AE)
Darkseid
Superman (AE with Lex Luthor, Brainiac and Bizarro?)
Ra's Al Ghul
Brainiac (Perez robot)
Lex Luthor (Battle Armor)
Terra
Cyborg (Vic Stone)
Flash (Barry Allen)
Professor Zoom (Wizard mail-away LE)
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http://www.hcrealms.com/forum/showthread.php?t=120914&page=1&pp=15