UNIX for Advanced & Expert Users

I prefer ksh93. I do not mind bash for interactive use and I suspect that many users use it mostly in that fashion. However for scripting work I try to use ksh93 whenever possible. It knows features like e.g. advanced job control, associative arrays, a.b. variables, call by value and call by name in functions, the way it handles locality in loops and floating point arithmetic. Plus (big plus) in my experience ksh93 really is a lot faster then any other shell I know.

I prefer ksh. I'm a huge fan of using automation to enforce standards. The ability of ksh to use FPATH and autoload to define ksh functions is incredible. This allows us to write common functions once that can be reused by everyone, eliminating the need to re-invent the wheel each time. This can be done in other shells, just not as cleanly as the ksh, IMO.

I prefer zsh - versatility of tuning is just perfect. Well, almost every shell could do that - but I prefer zsh - don`t even know why...maybe it`s love?

ksh -- If you familiar with vi, is good for you!
bash -- More friendly interface for new UNIX/Linux user!

The ksh shell seems to exist by default verses the bash shell which sometimes needs to be installed explicitly.

I started using Linux in the late 90s and I started on /bin/bash and really haven't used any other shell.

I have only used bash so for now its my *most useful* shell ;-)