Just wanted to chime in.... I have used all these methods with great success. In the end what you like is what will work.
I favor the connector plug. Cleaner, and easier to trouble shoot....
The real reason I posted in this thread.....
Please keep in mind a few items....
- Unless your using the same model PSU and/or it is not modular ignore this.... If not please do not use one modular cord from one PSU with the other. Or any of their adapters for that matter. Sadly I made this mistake and lost a PSU and MOBO in the process.
- If your using a MOBO with two 8pin 12volt connections.... Please do not plug one 8pin 12volt connection from each PSU to the one MOBO.. I believe I lost a Classified doing this! According to EVGA techs.... Only use the two NON adapted 8pin 12volt connections from the single PSU that the manufacturer supplied.
- I found that running two PSU's while allowing for a much cleaner power foundation for the system, it did push my circuits to the limit. I popped my UPS and breaker a lot.... And I am wired very nicely with serious UPS to boot.... In all reality I even went as far as researching for a 240volt setup to run my main system with.... Never found the right one for my needs though.....
Good luck and have fun!