Fish for interactive shell. “It depends” for scripting, but usually ends up Bash since it is the NixOS default.

oksh

I use mainly fish and occasionally nushell.

Nushell

Bash, zshell, BusyBox....you don't really need anything else

Bash is my favourite one, second to it being Fish

Bash. By default it might seem less featureful than zsh.. but bash is a lot more powerful and extensible than some give it credit for. It might be more complex to set it up the way you like it, but once you do it, that configuration can be ported over wherever bash exists (ie. almost everywhere).

I have been enjoying fish a lot over the last few months, but I generally try to use Bash, it makes cross-*NIX administration that much easier.

Bash, just because everything else already uses it. That and bashisms have infected nearly all of my scripts as I clumsily bump into the limitations of POSIX string manipulation.

I have found some very fun things with sed branching patterns as a result of these limitations though...

https://www.gnu.org/software/sed/manual/html_node/Branching-and-flow-control.html

Zsh with powerlevel10k + a few plugins

zsh because I've been using it since college and I don't like change

Bash as it is what I'm most familiar with. Having an eye out on the https://amber-lang.com/ that compiles to bash for future scripting purposes.

Bash is my login shell, but I have fish set as the default shell for alacritty

xterm+zsh

PowerShell, with zsh being a close second

POSIX on servers, thinking of switching to POSIX on desktop but that's a bit awkward

PowerShell, because of autocomplete and shift+arrows select.

zsh with grml config because I'm too lazy to make my own config.

https://elv.sh

xterm, because shortcut keys do what they are supposed to.

Edit:

Bash because it's default.

I used zsh, urxvt and konsole. I do prefer zsh. Urxvt is nice too.

At the moment I'm using zsh with powerlevel10k. But powerlevel10k is not really supported anymore, and seems to be basically on life support. While it still works for now, I have been thinking of switching over to fish. But the lack of posix compatibility is holding me back a bit.