I like using the new ones when I'm not using texture packs, I just prefer it because it looks better to me, and neither feel more "Minecraft" in my opinion.
Yea, I know it's how Minecraft looked, I've played since 1.4, so I'm pretty familiar with it, but I don't feel attached.
I've almost always used texture packs such as Ozocraft, Sphax, Pumpkin Patch, Lithos, and A New World. [All of these were popular packs for me] And a few others recently, so I've never gotten attached to a specific look. It just comes down to theme and what looks good to me, honestly. So...JAPPA for me, though for a more "Default" feel I tend to default to Jicklus, or Depixel.
Just my opinion though.