Any of the standard pump actions are proven and work well. People spend time debating the pros and cons, Ford v Chevy, but they all work well. The two you mention work well. As for the plastic trigger guard, some very experienced persons think it is a much better choice in an 870. I know you can buy the 590 trigger group in metal and drop it in. I would not sweat the plastic trigger guard. Take your pick of the common pump actions, they are all good. I like the 500/590 but the Supernova is a good choice as is the 870 etc. 20" max for home defense and it will allow a longer magazine tube to fit flush with more rounds. Once you hit five or more rounds I don't think it is a big issue.
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