I went from bash to zsh to fish.

1. I understood bash. Manual is good, searchable, understandable.
2. I never understood zsh. Manual is split up in several different man pages, very annoying to find what you're looking for. I never ever understood what I was doing, config wise. Just blindly following convoluted how-to's.
3. With fish, I finally understand every aspect of my shell again, and it's like 10x simpler than bash. Can be learned completely within 30 minutes or so.

Highly recommend the switch.