I use C-Space. Easy to type and doesn’t interfere with any readline or vim keybindings.

Same here. I also use space as my Vim leader, so it feels natural.

Same here to both. Only real conflict is with dunst [0] which also likes to use Ctrl-Space by default.

[0] https://github.com/dunst-project/dunst

Kind of related, I actually use tmux-modality to add vim style modality to tmux. For this reason, I don't often use the prefix. I switch to "command mode" to do certain operations (resize panes, change windows, etc).

I use ` as the prefix. For when I install tmux on a remote server and use a nested tmux session: ¡ (alt + 1) is my prefix.

My bindings (very happy with them): https://github.com/skilbjo/dotfiles/blob/master/tmux/keybind...

I've always used C-f. Very comfortable for me but I haven't seen anyone else use it. Importantly it keeps my fingers on the home row keys. I tend to use VIM navigation in my terminal so I don't miss that binding (although there's plenty of other keys in the general vicinity).

It's interesting to see which technologies people _don't_ use by what they bind as their prefix. The `Ctrl-]` guy probably doesn't do C, the `Ctrl-A` guy doesn't use VIM, etc...

I guess that is because all the good shortcuts have already been taken!

here's the config to use an emacs-like C-x prefix and xmonad-like joker/klown pane selection

https://github.com/ransomw/dotfiles/blob/master/tmux.conf

along with a rant about what terminal multiplexers are in the first place

https://github.com/ransomw/dotfiles#tmux

... both are wip, suggestions welcome

I use C-o.

My keyboard layout is set to dvorak, so the o is right next to a, lending similar convenience. I also haven't run into any serious conflicts in Vim, Emacs, or most shell stuff I do.

I find also C-a to be a terrible choice. At work, we have screen instead of tmux. I have configured screen to use C-b like tmux default.

Really not sure what a great prefix for me would be considering my caps lock is escape, not control

Ctrl-_, which is sent by Ctrl + 7 and/or Ctrl + / in most terminals.

I have been using C-q for many months now, and it works fine for me.

i've been using C-x for a long time now. i feel quite comfortable, specially after mapping caps to control.

C-q, no conflicts with emacs bindings.

C-]

I use both C-a and C-b in bash all the time.