I choose the one that's more recent and possibly less fanciful. As you're probably well aware of by now, there's been a succession of retcons going on with Tamriel lore since Daggerfall. Many of the ideas being tossed around at the time were half baked and might not represent the devs' current vision of that world. It seems to me that they've toned the Elves down and made them a lot less "Tolkien" in recent installments - more mortal. I see this as a positive thing. The lore is coming into its own and isn't relying on old tropes anymore like "thousand year old elves". That stuff's been played to death in a variety of fiction. Going by MK's rules I would consider it boring and therefore wrong.
Tribunal is actually more recent than the interview, which I'm not inclined to trust anyway for various reasons which I won't go into here. I won't argue about which is more interesting because that's purely a matter of opinion; personally I find it far
less interesting for Dunmer to live only a little longer than humans. Imagine if you could meet and talk to someone who was around in Shakespeare's time; that's what it would be like for a human to meet a centuries-old Elf.
On the other hand, I do agree that 1000 years is too long - if Elves live that long in general, it makes no sense for Barenziah to be an old woman at the time of Tribunal. Based on her appearance in that game, I'd put the maximum age for Dunmer at around 450-500. You're free to disagree, of course, but you can't argue that it's completely unfounded.
"True, few ever actually lived that long as disease and violence took their respective tolls. But they could. And one or two of them actually did".
Divayth Fyr and Therana, probably.
Divayth Fyr is over 4000, according to his daughter. It's stated in MW that some of the Telvanni mages increase their lifespans with magic, whereas TRB implies that all Elves can live that long as long as they don't succumb to disease or injury.