The immediate development of the c1-bishop is more popular.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... b8d7 An interesting move which leads to typical Queen's Gambit positions, but with a little more spice than the traditional 4...Be7. 5. c4d5  5... e6d5 