So what is your favorite grenade variant in the game and why do you like it?
Personally I have become fond of the Warlock Scatter Grenade when paired with the ability Bloom (enemies killed by your abilities explode). It can have an obscenely devastating affect on a group of enemies.
My second favorite is probably the Titan Lightning Grenade. It does so much damage but I have been burned by it a few times when it sticks to a vertical wall and zaps me or I throw it down while jumping but don't clear the blast radius.
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Firebolt or Axion Bolt. Cause corner campers.