Huh, that's a good offer to get both.
I bought Child of Light digitally already and I thought the artstyle was really appealing... and yet the actual gameplay was kinda boring? The exploration, pacing and characters were rather dull to be honest, the combat system was fine but not particularly engaging either.
Probably will get this because I haven't gotten Valiant Hearts yet but I really hope they improve things for Child of Light 2.