These are both region-specific models that are not available to us in the UK/EU market, so finding detailed specs of both these models to compare them is tricky.
There are versions of the 30x7G2-LS models available in the UK/EU market and so I would say that is a current model and probably the one we would lean towards.
I would assume that if there is no option to set Max/Min Size then the Max/Min Area would perform the same function (e.g. draw the Max area slightly larger than a human and nothing bigger than a human will trigger the event).
L - refers to white light (ColorVu rather than 'I' for infra red)(
U - refers to microphone (so the LF has no internal mic and the LU does)
F - means f*** knows as it isn't detailed on the Hikvision slide! They keep adding letters and will soon run out.
S - means Audio/Alarm interface. It won't have the built in mic but can accept a line level audio input via the terminal block and will have a hardwired alarm input/output)
I think the "-F" part of the naming convention only applies to the "Value Series" cameras available in certain regions, but it denotes that the camera has a micro SD card slot and reset button:
Most of the professional cameras without have this as standard (without an -F in the suffix of their part codes), so if it is something that you want on the camera, then it's best to check in the datasheet for it.