I am on mac too, although I have crossover (WINE windows emulator) installed to let me run RUUs if I need to.
I think scotty was referring the OP on this thread to method 2 because it is a bit simpler. In the other thread, he recommends the mini-RUU because a) it is slightly smaller in size than the full RUU b) Running the mini-RUU does not require you to do the re-locking step, like you do with method 1.
Per Scotty on another thread where he helped me:
the mini-ruu is in the 2nd post of Scottys noob friendly root guide-start to finish
basically,its just the stock boot,system,and recovery images. it lets you go back to stock without having to relock the bootloader. since the s-on unlocked hboot is prtecting hboot,radio,etc,there arent many situations where relocking and running the full ruu should be needed.
it just saves a little time,since to run the full ruu,you need to relock,run ruu,then re-unlock. all of wich will require multiple reboots
EDIT: OK, cool. Good to know. I have a stock GB backup as well so I will give that a try.