What would be better: DMLT or BMLT? I have Just completed B.Sc (H) biotechnology. Do I need to pursue Bachelors course again?

DMLT is the option as you will save you a year compared to BMLT. But I would suggest you to go for Masters as biotech is an emerging field and you have bright options as a biotechnologist. Also, if you are inclined towards medical labs, many genetic and molecular labs prefer biotech candidates.