If it's primarily low-light shooting you are concerned with, the answer is that the "better" lens is the one with a wider aperture (lower f numbers). But, especially on a compact super zoom camera like this, factors like sensor size and sensor tech generation will be more important.

Here, the maximum aperture of the two cameras isn't very different -- f/3.3 for both at wide angle, and a non-significant difference of f/5.9 vs f/6.3 at the telephoto end (zoomed in). I'm sure that these lenses are engineering marvels, especially considering their size and price, but don't be fooled by the marketing: in order to fit so much zoom into a cheap lens, there is inevitably a lot of design compromise. You can take great pictures with it, but don't think your results will be like that from a high-end SLR lens.

Both cameras have a 1/2.3"-class sensor, which translates to "a baby's thumbnail size". This is also not great, but modern technology is pretty amazing, and depending on your pickiness level, you may be perfectly happy. Many people certainly are, with either model. I really wouldn't sweat the differences too much — unless you're prepared to go up a large factor in price, I'd just pick the one of these you feel most attracted to and go with that.