Looking at the track record of vBulletin for security, and seeing how XenForo is mostly the old vBulletin guys starting a new project, there were security concerns.
This is a very silly reason and hopefully wasn't something of serious considering during the switch. vBulletin was largely secure pre-vB4, which was the point Kier, Mike and Ashley left the Jelsoft team. We've recently seen an IPB hack (exposing plaintext passwords nonetheless) at NB so hopefully you made the right decision.
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Posted · Edited by Deity
This is a very silly reason and hopefully wasn't something of serious considering during the switch. vBulletin was largely secure pre-vB4, which was the point Kier, Mike and Ashley left the Jelsoft team. We've recently seen an IPB hack (exposing plaintext passwords nonetheless) at NB so hopefully you made the right decision.