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Intel San Diego
Overall, based purely on first impressions of both devices at launch, I'm more impressed by the Intel Orange San Diego. It's cheaper on contract (and virtually the same on pay-as-you-go), has a better-specced camera and has a nicer screen.
That's not to say that the ZTE doesn't beat the Orange phone (pictured) at points — it works with all the Android apps in the app store, for one thing.
However, I'm struggling to work out why you would choose it over the San Diego, unless you really, really wanted a dual-core phone or ICS in August instead of October.
Image credit: Ben Woods