Welcome to AP.

I have no specific advice, but if a camera does 4K video it can also do lower resolutions, like
1080p. You'd just select that option. I do that on my Galaxy 5S phone if I have no need for the
higher res. It's mainly the time limit you'd need to look out for.

That a camera may be "only 10.28 MPx" matters less than other factors, such as but not only,
sensor size. A 4K video frame is 3840 x 2160 px ~ 7.5 MPx . I do not know how Panasonic can
achieve a video resolution that is greater than their stated sensor size of 3680 x 2760 px, unless
by some sort of interpolation. It is certainly capable of a host of video resolutions, as listed on this page.

Both of the other two cameras have 1080p video resolution, and limited file sizes (4GB), though
that is still considerable.