Between those two models, you might want to go with t3i 600D as they called in Europe. It have some cool features, 3x magnification from the sensor not electronically, it works with Magic lantern (continuous recording, focus peaking (notice that this model do not have AF in video mode) and other photography related twaeks that I dunno as long as I don't realy take pictures

Not ashamed to say that I still use it until today, paired with 10-22 for landscape and 17-55 2.8 IS for low light anrd handheld, still works great

Kind of rule of thumb after 400-800 iso, noise appear in video. You might need to research some more to see if it fits your needs.