I've used both, but still prefer Socialscope. Like you mentioned, Socialscope is quite fast. I haven't experienced many bugs, though there are a few quirks I'd like to see corrected in future updates. Socialscope has the added perk of being a very versatile app because it's not just a standalone Twitter app but can also do Facebook and 4square. But if we're just coming twitter app versus twitter app, I think Socialscope wins out with it's stronger feature set.
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