We all play differently. To that end, with 18 different grenade types to play with, i'm curious about your favourites and why. Me personally, i love my bladedancer's sticky grenade, because it is just hilarious to stick onto peoples heads in the crucible and usually nets me a handy postmortem kill :p
EDIT: Loving the stories and responses from you guys!
EDIT 2: guys we're trending!! Thanks for your awesome responses :D
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My favourite grenades are the firebolt grenades of a warlock sunsinger. Those babies mean I can get kills with an atrocious aim and kill enemies fapping behind cover. Same goes for the voidwalker's axion bolt grenades. Also, with the extra grenade perk and radiance active, I can literally make it rain pwn bombs on my foes.