transmission fluid filter and gasket questions , metal or not ?

For a daily driver, use the dacron(paper) filter. The metal screen allows a little more flow, but, also allows more particles through. That is used more for race applications where there is a very regulator maintenance schedule. I used a Turbo Action trans brake valve body for years, they recommend the race in. As far as the gasket, I have never had luck with the rubber gasket.