Oy. Are you sure you want either of these?

According to a quick Google search, the low-light performance of the Canon is relatively poor. It's claiming 3 lux at 1/30th of a second. That's going to give a jerky appearance to movement as "standard" HD frame rate is 60 frames/sec. I also suspect that the 3 lux claim is optimistic (there's no hard standard for lux rating, which is why the camcorder manufacturers like to use it). According to camcorderinfo.com (which tends to be a cheerleader for new machines), low-light performance was disappointing. 24 fps is of use ONLY if you're going to be transferring to film and, believe me, you're not going to shoot a feature film with this camera.

The Sony is an AVCHD machine that has an arbitrarily over-limited bandwidth. This means that (1) its video output isn't supported by virtually any editing/authoring software, and (2) there are going to be LOTS of digital artifacts due to the limited bandwidth.

What do you want to use these cameras for? If it's very casual use, e.g. the kids' birthday parties, it probably doesn't matter (as long as they're held outdoors). If you're concerned with quality, however, you'll likely be dissatisfied with both.