A camera is a light recording device. When there is not enough light, there is a list of things that will help the camera record a better image. One is flash, but the built-in flash does not work at long distances. Two is using a high ISO (one of the camera settings), but that makes the photos noisy/grainy-looking. Three is to use a longer exposure time, but that does not work with moving subjects and also it requires using a tripod. Four is a wider aperture lens which lets in more light, but that makes the camera bigger and more expensive. Five is a bigger digital sensor which also captures more light, but that also makes the camera bigger and more expensive.
The two cameras you are considering do not have number four or five of the above list. Without knowing what you want to shoot in low light, I cannot say if either of the two cameras would be good for what you want it for. If you want a long lens camera for shooting indoor sports or concerts/stage performances, neither of the two cameras you have chosen would be good for that kind of shooting. The closest camera of that type that might work would be the Panasonic FZ200, which has a wider aperture lens...and also a higher price tag.
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