I agree with the others who have posted, it is completely subjective but given a choice I prefer the second render.

As to formats I have a long history of photography and it is usual to save any photo in TIFF and only use JPG as the last action.  If you keep modifying a JPG you loose detail due to compression each time it is saved.  With the advent of digital photography, in most cases, the starting point is RAW then TIFF and JPEG.  This is much for the same reason as before in that you capture all of the data with RAW allowing you far more flexibility with post processing the image.

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.