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Canon HV-30 vs Sony HDR-SR12....? - canon vs sony prosumer video camera

I did some research and I am interested in these two video cameras. I do not understand the differences in the quality - and performance in low light, and how the larger CMOS sensor from Sony in the promotion or obstruction of. I do not know "alter" the need of the time difference. I do not know whether the various game modes (24p, 30p, 60i) in the Canon VS Sony (60i), and whether or not important. I do not know whether the recording on MiniDV is a much better picture quality than recording to a hard drive or flash memory. Expert advice requested.