Depending on game mode I either go for Titans Lightning grenade, or Magnetic grenade.
LG is good for blocking entrances, stop people from scrub-chasing you, or to clear out Control Flags.
MG is my go-to in slayer games, because there's nothing like sticking an enemy and watch him run straight into his allies as he tries to get away.
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And because it detonates twice, extra kills!