I vote Luffy because he is my boy, but DBZ levels are a bullshit in this point lol After this, it is even hard to calculate their powers if we look the things in hindsight. But, even with all the inconsistencies, Raditz is so much for OP level.
At least I think there are some hax that can kill him, but not much than that. And Luffy don't has any hax against Raditz.