I commented above. Ascetics wise macOS has better font rendering. (A lot of nice community made themes for iTerm too). But clipboard works flawlessly out of the box with tmux/zsh/vim/emacs, TrueColor support is awesome too, splits and tabs are amazing and work nice (I know that tmux has something similar to offer, but I really like tabs in iTerm, and I use it in combination with tmux). Amount of customization is staggering really, and app overall always performs well, no latency or lag whatsoever, and is really stable too. While on Ubuntu things were crashing, a lot!