The first shiney i EVER got was in the friend safari. A shiny Fraxture just snuck up on me. It wasnt until after that that i actually got into the shiny pokemon stuff. I tried out the Masuda Method and after only 8 eggs i was able to get a shiy charmander. So i cant really say which works better. Both of these instances happend within a few hours of each other.
Well then. SOMEBODY'S been lucky.~
Congrats on your shinies. (: I'm at 130 something eggs and I haven't gotten it yet.
But overall it seems people have been luckier in the safari...