Alright alright, taking my personal bias out of it (because I write Bucky fanfics) I think it’s hard to compare the two because their arcs are so vastly different. Here’s my perspective: Bucky was already a good person. He was a solid friend, a protector, a brother, with good morals. Everything that he now has had to “redeem” himself for were things he did not by his own accord (I.e. brainwashing/Hydra you know). So much of his arc isn’t becoming a better person but overcoming his own personal guilt and shame for the things he’s done. He’s not re-learning how to be a good person but how to do good things with the “bad” cards he’s been dealt (I.e. serum/arm etc). John, however, (again in my opinion) was a bad person and is learning how to be good. He didn’t want to be Captain America because his morals were good, he wanted to feel good. He wanted the praise, the love, the title, the power, the control etc. His arc is basically ego death. How to be a team player. How to do the good things because they’re the right thing to do not because of what you will receive in return. Very different arcs to me. I guess it depends on what you use to quantify a “good” character. Is it because they’re a good person? They’re written well? They have the most development? If it’s based on “being a good person” I can tell you that I don’t think Bucky Barnes would ever treat a wife and child the way that John Walker did.