I prefer the European nightcrawler
over the red wiggler when comparing the two for worm castings.
You can use the 14 Day Worm Castings
method with the European nightcrawlers however it will take approximately 4 weeks to complete or so.
The worm castings will not usually be as large as with the ones used in the 14 Day Worm Castings however will be much nicer looking and easier to use than those produced by red wigglers.