I personally like the Emacs keybinds because they are also supported in Cocoa Text framework, which means native Mac applications respect them. It's not just the terminal that follows these keybinds, but every graphical program in my system. You can actually use S-c / S-v and C-k / C-y to maintain two clipboards at once. This is a feature I miss every time I have to use a computer that is not a Mac. I also like being able to use C-a, C-e, C-k, and move between words with M-<left> and M-<right>. In the case of Emacs, the proper keybinds are M-f and M-b, but Mac also uses meta key as a sort of compose key, so this is the keybind used in graphical applications.