Docker or Native Ubuntu

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As a huge plus for Docker, migration from a dead or outdated server to a new one is a snap. I've done it twice now. I'd disagree on the idea of complexity with regards to storage, GPU, etc... unless you know nothing about docker and don't plan to use it for anything else. If you're new to docker and have no interest in running other services, stick to bare metal. If you run quite a few services and maybe want to expand, look into compose and how easily you can control and monitor an entire stack of services with a single yaml file (or organize it by having one for each service, then a main file that "extends" these services).

Docker means if I break shit, I kill the container and prune my volumes. Bare metal? Slightly more complicated. In some cases, full rebuild more complicated.