I dislike the default prefix key for both screen (C-a) and tmux (C-b) because they conflict with useful commands in emacs and the terminal (go to beginning of l

I dislike the default prefix key for both screen (C-a) and tmux (C-b) because they conflict with useful commands in emacs and the terminal (go to beginning of line, go back one character). I finally found C-j worked well for me (for both) because I very rarely want to use it directly so the occasional C-j C-j doesn't bother me much. I found only 4 alphabet characters that didn't seem to have a conflict with something I used often enough for it to be annoying: g, i, j, m. Tried each, settled on j because of comfort while typing. Also hitting C-g when I wasn't in tmux turned out to be annoying on some systems.