Geographic Information Systems

Both have plenty of docs for the stuff you're running (pg/tomcat). If not finding anything for Fedora Server directly then a search for another RHEL will give you whatever answers you need. I'd go with what's easier for you and whoever else you're working with to maintain.

I'd consider using containers instead of direct installation if it's a more hobbyist thing. Kartoza produces images for Postgis and Geoserver which aren't the best for serious scaled production workloads but work well for getting up and going quickly. It lets you worry a bit less about distro specifics and building the right dependencies and all that jazz.