The injectable is so expensive it would seem a waste to drink it when you could buy the tabs for far less money.
I'd do both. The tabs are full body IGF effectual, while the Injectable shows a localized effect. According to some studies this effect last only around 2-3 weeks before the body gets used to it. So I would use Injects for 2 weeks and switch to tabs for two weeks and alternate in that fashion if I were ever to use Winstrol - such a harsh drug, probably the harshest commonily used steroid, I'd even argue that it is harder on one's body and overall health than Trenbolone.