Hi, I plan to use the NCBI taxonomy data which is publicly accessible as reference. I am about to transform the original format to fit an importable format for qiime2. I just notice there are four types related to taxonomy
You can ignore the *DirectoryFormat versions, as they tend to run behind the scenes, and not useful anyway if you are simply importing taxonomy from a single file. So, you'd likely stick with TSVTaxonomyFormat or HeaderlessTSVTaxonomyFormat, likely the latter.
Depending on your needs you can use RESCRIPt to fetch reference sequence and taxonomy data from GenBank.