And who do you think first brought up the interview one a while back?
What SU do you like more, the normal one, used in most RPs, or the interview one?
I honestly do prefer the interview SU. Not only does it give you a chance to test out your character's voice, it makes it challenging to sway from the typical seven million paragraphs for the appearance, history, and personality sections. After all, would you want to bore someone to death with every little detail about how you look? :P Also, some people may find it hard to explain their character's background and personality throughly in typical SUs. As said, with interview SUs you aren't supposed to give every little detail.
A mixture of the two is also good. The interview can be like the RP Sample portion, ya know? One thing I've come to not like is when people ask for an RP Sample of yours from another RP. If you're playing a completely different character than that in the sample, then how will the GM really know how the character you're apping acts? Yes, they can look at the Personality and maybe History sections, but those are still generalizations.