For me, it's just: > Deep tmux integration. iTerm2 can speak directly to tmux and display its virtual windows as native windows or tabs, making tmux much easie

For me, it's just: > Deep tmux integration. iTerm2 can speak directly to tmux and display its virtual windows as native windows or tabs, making tmux much easier to navigate. I actually prefer Terminal.app otherwise, but the tmux integration is so good it's worth it just for that.