T3i has less noise than t4i ?

I bought the t3i recently but the t4i's price dropped and now, I don't care about the extra $100 if I can get a better equipment.

It seams the t4i has some nice improvements over the t3i BUT, I've read on many sites that the ISO noise is worse on the t4i than on the t3i which seems weird to me.

Sites stating that noise is worse on the t4i :

"The bad: The feature set remains rather blah, and its photos aren't as good as the T3i's at high ISO sensitivities."

"Overall, the photo and video quality of the T4i still rates as excellent, though at high ISO sensitivities it's slightly surpassed by the T3i; it looks like either the blue channel in the new sensor just isn't as sensitive as the previous one or Canon's processing the heck out of it."

http://reviews.cnet.com/digital-cameras/canon-eos-rebel-t4i/4505-6501_7-35329243.html

Advantages of the Canon T3i

Better color depth22,1 bitsvs21,7 bits (Distinguishes 0,4 more bits of color)

Lower noise at high ISO793 ISOvs722 ISO (The T3i has a slight edge (0,1 f-stops) in low noise, high ISO performance)

Better image quality 65.0 vs 62.0 (Almost the same)

More dynamic range11,5 EVvs11,2 EV (0,3 f-stops more dynamic range)

http://snapsort.com/compare/Canon-Rebel-T4i-vs-Canon-T3i

BUT, on this video, if you watch it in 1080p, you can see more noise on the t3i video in dark areas... http://www.youtube.com/watch?v=iqjzwXiX250

So, what is true, and why ?

Thanks