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It's so interesting - it seems that fish is getting more and more popular lately. I tried it ~7 years ago and thought it was severely lacking, so I just stuck with zsh and have never really had a reason to look back. Maybe I'll check out fish again at some point - what features does it have that drew you to it?
Almost everything that you might get from oh-my-zsh is built in and it's _much_ faster. I've been using Fish for a few years now and I love it.
I don't really use `oh-my-zsh`, I just built my own prompt. It's pretty snappy, so I don't feel a huge need to switch, but maybe on a slow day I'll install fish to give it a whirl.