Actually, the differences are probably pretty minimal. The Zen focus is supposedly quicker, but in use it's still slow. I've used both focus versions (though not side by side) and as I recall, it probably won't make much difference either way. I tried the Atlas Intrepid, by the way, another clone version with the original, slower focus.
The Zen has dialectric prism coatings, but again as I recall you won't notice any difference unless maybe you have them side by side. Both will be bright, with a somewhat warm/yellow color.
Oil/water repellant coatings may be a little different, but probably nothing to worry about.
From what I can tell, all these open bridge Chinese ED's are basically the same--stunning views, good ergonomics, but with a really slow focus.
I'd say get the Hawke if that's easier. You will like like them.
Mark