Performance is totally subjective on what hardware you're using to running that BB system.
Security. Every product strives to be as secure as possible. Through the history of vB and UBB, there have been security bugs. That's probably not going to change. To say that one BB product is more secure than the other is very foolish because there has not been ONE BB product on the market which had to update itself with a new version due to a security prob.
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