I think i read a very good article on meso that the best way is to do 2 weeks oral 2 weeks injectable. Both have pro's and cons.
Injectable winny is believed to be stronger mg per mg than the oral and is thus thought to be more anabolic. It is also thought to have a slight sight specific growth effect. It is also muce h less toxic to the liver.
The oral, which is much more toxic to the liver, is also believed to increase IGF-1 more than the injectable and decreases SHBG thereby increasing free testosterone.
So both have pro's. I have used the 2weeks 2 weeks protocol before for 8 weeks in a winny only cycle and was quite impressed with the results cause i didnt expect to see much.