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Who do you think is the best librarian in the game. Or who has the best librarian powers special abilities. What would you upgrade for your librarian?

Depends. vanilla, SW, BA, GK, all have nice powers that fit the army.
Saying that one is better than the rest would depend on the context.
BA lib can be a beast in close combat, vanilla null zone is great vs TH/SS Termies,
SW Jaws can ruin the day for nids, and GK shrouding helps protect an expensive elite army, just to name a few.
They all have nice qualities for their army, and they each have their own strengths.

Actually I like the DA abilities and especially Ezekiel. I wouldn't take them.

I love that mephiston can do three powers per turn. Should I unleash rage, force sword or st10 sword? All three then unless you are on three wounds.
Tigirius the tactical genius if used well can be great.

Keep librarians plain as they have everything they need, apart from Rune priests like a few extras and also jump packs/bikes may be needed.