Redhat is considered the gold standard for professional linux certs in the US. Linux foundation's are considered very good by people who have taken both, but are less recognized by employers. LPI and Comptia certs are considered much lower in quality.

If your goal is employment, it is generally considered good to pair the OS cert with a platform cert, for instance a public cloud sysadmin, like AWS sysops or Azure sysadmin, or something like Openstack or VMWare.

I would also recommend you set up some public code repositories ( something like github,) that contain automation code to provision and configure an OS + basic service (like a webserver,) on a public cloud. Doesn't have to be novel or complicated, just show that you have the basic skills to grow from. Terraform is popular for infrastructure code, puppet is a popular match for system config parts, I'm particularly fond of using Ansible to do both. If you go into an interview with a portfolio of example code of "I can provision a minecraft multiplayer server on (aws|azure) with a single command" you're going to be in a lot better position than someone that has no example.