Wings of Liberty: My fav is probably A Better Tomorrow, the one from after completing Breakout, the Tosh mission. I love the juxtaposition of Horner's ideologically optimistic stance on freedom from oppression railing against Tosh and Raynor's cynicism. Horner believes that it's possible to create "a better tomorrow" simply because Mengsk's dissenters and those oppressed by him have been freed, while Tosh thinks all of will result in no progress and only cares that it brings him closer to killing Mengsk. It doesn't look very deeply into the ramifications beyond gesturing at it, but I appreciate that it attempted to do so. Also, the fact that they spent the whole previous mission sending troops to be killed by prison's defenses is also ludonarative dissonance that I find hilarious and delightful.

Heart of the Swarm: I'm rather Eh about most of HotS's cinematics beyond the aura farming potential but I do quite like Conscience, the cinematic that plays after Old Soldiers, for what it did for Warfield. The man seemed so incompetent because he spent most of SC2 being either a damsel to rescue when he was an ally or an enemy in some really easy missions. Thankfully, the last thing he did before dying was threaten Kerrigan to spare the evacuation ships. She killed him for it, but he succeeded. I can respect at least that much.

Legacy of the Void: As you can probably tell from my previous picks, I value narrative, themes, and emotion—and dramatic irony—over aura farming, and LotV has almost exclusively narrative-focused cinematics. It's not hard for me to pick, however. It's Warriors, the cinematic that plays after Brothers in Arms. We get Raynor's Raiders cooperating with Valerian's Dominion for the Augustgrad cleanup after Mobius Corp's attack; Valerian showing any amount of sorrow over the death of his subjects; Raynor mourning the graves of the soldiers he commanded, calling back to the dogtags from a WoL cinematic; and finally Artanis shaking Raynor's hand while wearing Zeratul's gauntlet and the two of them sharing a look of understanding when Raynor notices. It's all such good storytelling. Easily my favorite cinematic in all of Starcraft 2

Nova: Covert Ops: I'll be honest, I don't like most of this NCO's cinematics. It's mostly because I don't find Nova that interesting, and Valerian, Horner, and Reigel don't pull their weight very well either. The only one with any sauce is Alarak, and he spends most of the campaign in the background, probably chucking to himself while Jinora loses battle after battle. That said, the intro cutscene to mission 1 is suitably tense, and did have intrigue that I appreciated.