I used Fish for years and eventually switched back to Bash and then to Zsh because I couldn't really deal with all the differences in the two, and the lack of customization in Fish. I'm interested in giving it another shot, but I'd really like to know what you like about it in the first place.
I like Fish because I find it has sane defaults, i.e. {coloring, autosuggestions, completions} all work well out of the box with zero or little configuration.
You can replicate a fish-like feeling in zsh (coloring, completions, etc), but for that you need a plugin manager, a million bajillion finicky plugins, and then configuration/performance hell [1] happens. I tried that, got bored of it, then learned to fish and never looked back at zsh.
That being said, out of the interactive shell I don't like the exoticism of fish as a scripting language; I keep preferring shebanged, shellchecked [2], defensive [3] (ba)sh scripts, they're a stable and portable evil I know.
Also, I'm curious what makes you feel "lack of customization in Fish": what can you customize in Zsh that you cannot in Fish?
