With the compressed air remember that the first thing to do is be ruthless about leaks, as those are a straight pouring of money away in both power used to compress air and in reduced compressor life. Ant leaks should be eliminated as much as possible, and if you can install shut off valves every tap off, as they are cheap ( for a simple 1/4 turn stainless steel ball valve, which has a pretty good life as well) and reliable.
Remember as well the tanks need to be pressure tested every few years ( depends on where you live, a pressure test generally is also a requirement for your insurer as well), plus you do need to either have an auto drain valve, or a regular regime of draining the tank every day or when you use it.