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Paper filters definitely produce a better quality cup, but I like the convenience of not having to worry about how many to pack, whether they'll get crumpled up in transit (or somehow go missing).
With the metal one I can at least just store it in the aeropress for the travel time (I imagine long-term that may do some damage to the rubber plunger). Picked up a Koffi branded metal filter a good 10 years ago and it makes pretty decent coffee. Just need to make sure you don't fall back into the habit of knocking the filter + puck into the bin.
On the travel coffee setup discussion, I'm firmly in the aeropress + porlex camp (with a metal filter to minimise extra crap to bring). Last time I ground my coffee at home and brought it with me, the taste was fine but I honestly found the faff of weighing ground coffee more annoying than beans to the extent that I'd rather just grind per drink.