Regarding CZW not having straight wrestling. CM Punk, Chris Hero, Mike Quackenbush, AJ Styles, Christopher Daniels, Kevin Steen, El Generico, Roderick Strong, Alex Shelley, Sonjay Dutt and Claudio Castagnoli have all competed in CZW. Plus their Best of the Best Tournament used to attract good wrestlers and the final of BOTB 5 with Steen, Super Dragon, B Boy, and Quackenbush is awesome.
The main difference between CZW and Big Japan Pro Wrestling/FMW is in Japan they actually build up to the major spots so it's alot like a horror movie (we all know that the anticipation of what's gonna happen is usually better than what actually happens).