On an individual scale of al-Aluaki vs. Abrego Garcia? The dead guy, but he's dead and I can't do much about that. Plus, unfortunately all presidents are ordering people in other countries killed all the time without trials, and I'm against them all. That includes Bush, Obama, Trump, Biden, and Trump again. In terms of the scale of the problem, this one is affecting WAY more people, so it's a much bigger overall problem in terms of number of people/lives affected.
It's discussed in dozens and dozens of cases, as well as the text of the Constitution itself which reads that "no person [note that it doesn't say citizen] will be deprived of life, liberty, or property without due process of law."
As to just a couple of cases, there was Yick Wo v. Hopkins, Wong Wing v. United States, and Reno v. Flores just to name three.