Both can be productive depending on what what you have practised. Being good at command line will give you one more ability - "compose" various commands togethe

Both can be productive depending on what what you have practised. Being good at command line will give you one more ability - "compose" various commands together to do complex task in a single command whereas the GUI guy can't do that as you can't compose "pixelated output". Think of this like - to do some task in GUI the guy will do something like - click, wait, click, type, wait... where as the command line guy would just write a single command composed of other commands.