Y'all know it's Utrom Empire!
Spoiler:
Which gets a little bit sadder with every drastic change in the Utrom hierarchy (the scene of Krang collapsing in the stasis chamber being particularly sad now), but also shows how different Krang was before everything happened. While he seems to have had more of a death wish - which came at the most ironic of situations in his life, he had space for a little logic and a lot more willingness to change himself if need be. He very had a different persona until he was left on his own and I like to think that isolation got into his head.
One thing I like quite a bit is how Krang himself is rarely shown in present-day scenes, being concealed by his suit and even hidden at some points. I'm not sure if it was a deliberate choice or not, but I like to think that it is.
I'm not too keen on some of the designs of the Utroms. With the exception of Quanin, something seems really off about their proportions and it always looks like Krang is going to tip over sideways because of how top-heavy he is against his legs. And where do all their organs fit?
Most of all...gotta love Krang telling his father that they won the D'hoonib war while smashed on whatever booze he was drinking
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And the Obligado minis.
I'm not exclusive to Utrom stories, surprisingly.
I do like the Hob-Leatherhead story in TMNT Universe as a single story.
Donatello's micro of meeting Harold is another favorite.