I have a Nikon D90 and I am interested in these two flashes. I'm new to using flash for photos so I would like some feedback on what the main differences are between these two. Both seem to have gotten the good reviews and both cost about the same.
Well the main differences are the power output guide number 58 Yongnuo vs 30 SB600. That's quite significant difference. Also Yongnuo has external power pack connector and PC sync port. I'd probably go for the more powerful flash so in this case Yongnuo.