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Which gun is better and why

I'd say (and voted for!) the blight launcher.

Reasoning:
1) Available for cheap in issue 2 of conquest!
2) wounds on 2s rerolling 1s vs T2/T3, which is better than plasma gun even if supercharged.
3) wounds on 3's rerolling 1s vs T4, which is better than a plasma gun unless supercharged.
4) Wound on 3's rerolling 1s vs T5, which is better than plasma gun even if supercharged.
5) Throws 2 shots even out to 24", which is double firepower and allows you to use More Bullets for a third shot
6) Causes D3 damage without supercharging
7) Is an assault weapon, allowing you to advance and fire (without penalty in the case of a heavy specialist)

The plasma gun is nice for the champion, because so few leaders get a decent ranged weapon, but skip it for the gunners in favour of either launchers or the "plague flamers"

For me the plasma on the champion and atleast one blight launcher is an auto-include.

After that, I'd debate depending on the enemy should I take the plague spewer or another blight launcher.

In the Campaign I’m playing now I included in the 12 starting models 2 BL, 1 Plasmagun Gunner and 1 Spewer.

Even if I tend To use 2 BL and a Plasmagun on the leader I’m used to 1 BL, 1 plasmagun on the leader and another plasmagun on the second Gunner.

If there’s à ranged weapon I dont use that much is the Spewer.

Toi short ranged

Blight Launcher has the advantage of a re-rolls ability, a d3 damage profile, and assault to benefit from Heavy Specialist and the More Bullets Tactic. I would only take Plasma over Blight Launcher if it is unavailable for whatever reason.