I’ve decided to dub these two the Sisters Of Absolutely No Mercy Whatsoever. I have mixed feelings on the two characters based on their comic history, admittedly based in part on my limited exposure to them. I don’t know that I’ve read more than a few comics with Nebula in them, and my exposure to Gamora in large part stems from her time with Adam Warlock’s Infinity Watch in the 90’s, when her prime function was standing around in a swimsuit with large mesh segments and wearing a cape.
The reinvention of Gamora into a character more befitting her sobriquet as the deadliest woman in the galaxy occurred later, and the concept became the cornerstone of her portrayal in the MCU. While Peter Quill does give her a tough time when they first meet, there’s no questioning that she’s come a long way from the shallow portrayals of her early comic history. There’s a reason her two attacks in Crisis Protocol are God Slayerand Cosmic Assassin.
Nebula largely flew under my radar as a cosmic bad guy in the Marvel universe, until Karen Gillan’s reveal that at a comicon panel that she’d shaved her head for the role. So yes, I freely admit that my fondness of Nebula is almost entirely based on my being a fan of Karen Gillan from her time as Amy Pond in Doctor Who. I regret nothing.