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As a loyal user of Dash, I find the interface to fit in very seamlessly with OS X. An app built using either offline HTML or a cross-platform toolkit would be unlikely to achieve the same level of consistency with OS X conventions, at least based on my experiences with other such apps.

How can you provide offline anything with a web-based app?

Lots of ways actually: it could be hosted on the web but use HTML5 offline storage and caching; it could use something like node-webkit or atom-shell; it could be a Chrome extension.

Much quicker access through a HUD.

Can you get a web-based offline app to be invoked by a global keyboard shortcut and appear instantly?