ummmm.... well...
If were looking at true server cases, they are rack cases.
So like 4U, 3U, 2U,s and 1U designed to go inside a tower rack which holds many PC's.
If your talking about a desktop server case, then no... outside it being more expensive because of the tag "Server" they are all basically the same outside some crevits like being able to hold a EATX form motherboard.
Some "Server" cases will have the hotswap cages built in.
Gaming cases are just normal cases with LED's and very abundant fan options.
Most gaming cases are not meant to be quiet. Some are, but in design they are meant to have many openings where u can cram fans into.
So to be honest, if your building a server case for your dad, and your dad's pc will not have an obnoxious GPU, ie.. 1070gtx / RX580 i would not even consider both of those cases and probably use a normal case like a fractal design R5, or a Phantek Enthoo.