Between the two I would rather we continue using the current ZD Xenforo software since so much has been done with it in the last year. We have lots of themes that will be dropped if we just make a huge move. But they do have a nifty login addon that allows someone to sign up on their main site and have it connect to their forum accounts and main site comment accounts. Xenforo does not seem to cover all bases like that.
I agree here. In addition to the themes, moving to their forum software would cause us to lose our add-ons, some of which I imagine would have replacement equivalents but most likely not all. These are things like the shoutbox, social groups, arcade, awards/medals, force ignore, shop, credit etc
It would be handy if there was a way to get the bridge between the ZI main site and the forum accounts working on xenforo in a similar way, perhaps the staff from ZI would be more knowledgeable about how to go about that.