Both shoot 1080p video
Advantage Canon if you want to give it "film" look by shooting at 24 fps (24 frames per second) and it can record at 240 fps which is good if you want to use slow motion playback. The faster shutter speed at 1/2000 (1/2000 of a second) is better for capturing fast moving objects but the 1/1600 should be fine. The advantage goes to Sony if you want to take many shots in rapid succession (10 fps vs 2 fps).
Depending on the review you read both are good in low light situations.
The camera's are so close in performance it really a matter of personal choice. If I had to choose I guess I would go with the Canon.
After weeks of usage, I found that image are painting like when viewed in our 24" Sony Bravia LED
see this CNET sample images http://reviews.cnet.com/2300-6501_7-10014670-2.html
. I wish I saw this before I bought. Compare to IXUS 125, sony is disappointing. Also most of my shots get blurred (note: just my own personal experience).
1080i video are great though.
I hope I went with Canon IXUS 125.
Thanks a lot anyway.