@sujit, Blue is a better buy as it can retain charge for longer time. This point was discussed already somewhere in TE itself. Search in the google for eneloop battery reviews, you will know why these hybrid batteries are better than the regular High Mah batteries.
Edit:
Review: Testing Sanyo's Eneloop Low Self-Discharge Rechargeable Battery
Edit:
Review: Testing Sanyo's Eneloop Low Self-Discharge Rechargeable Battery