Logistical questions about dumping games

[KoopaTroopa80]

I just had a few basic questions on dumping games.

1. What is the preferred/best dumper to use - Homebrew store? Itemzflow? It doesn't matter since the dumping code is all based on https://github.com/Al-Azif/dumper-testing
2. Is there any point to keeping the dumped files once the fake package has been created? Is the process of creating fake packages reversible - extracting the files from the fake package will give you the dumped game files?
3. I see in the dumper-testing code that it generates a GP4, can that be used to create fake packages directly or do I have to use gengp4_app/gengp4_patch from the Fake tools package? Is there a command line tool to generate GP4 so I can automate the process?
4. For building fake packages, does libOrbisPkg work just as good as Fake Pkg Tools?

Thanks!