You can use Hiccup style with Om via sablono if you like via http://github.com/r0man/sablono. Om will never dictate nor provide an alternate syntax layer as everyone will want something different. I personally don't care for Hiccup.
More importantly, Cloact is much closer to the React model while Om diverges quite a bit because we're interested in enabling patterns that are more difficult otherwise, trivial complete UI state rewind on exceptions/errors, trivial undo, and more powerful operations on the applicate state history oriented at interactive debugging and development.
Of course these values might not interest you and you just want a simple direct mapping onto React. Then Cloact looks awesome! :)
More importantly, Cloact is much closer to the React model while Om diverges quite a bit because we're interested in enabling patterns that are more difficult otherwise, trivial complete UI state rewind on exceptions/errors, trivial undo, and more powerful operations on the applicate state history oriented at interactive debugging and development.
Of course these values might not interest you and you just want a simple direct mapping onto React. Then Cloact looks awesome! :)