You could stack it with literally any of the testosterone esters,,CYP,,PROP,,ENAN,,SUST,,whatever works best for you. Some people like using WINSTROL on the last half of the cycle to diet down and harden up on.

Oral Winstrol dramatically reduces SHBG and therefore frees up lots of test. It works synergistically with test for that reason. Injectable Winstrol promotes nitrogen retention so it's better at building mass. But still not as much as many other compounds that do the job better. Injectable Winstrol is just oral Winstrol dissolved and it's more hepatotoxic than oral Winstrol.

Advantages of Winstrol - no water retention, no aromatisation, oral dramatically lowers SHBG and injectable increases nitrogen retention. Winny also has anti-progesteronic action and it tends to build strength without adding much mass so it's good for athletes competing in weight class divisions or sports where extra mass is a disadvantage.

Cons: wreaks havoc on tendons, isn't very anabolic - lots of other compounds can do a better job at building both mass and strength.

I see it as a niche compound for specific purposes. I have some oral winny and I've been considering ways I might use it effectively in the last month of my current cycle. One thing I like is the idea of tapering off test and the winny wiping out most my SHBG at the same time allowing more free test with lower serum levels. And because it doesn't aromatise it's a way to shed some bloat whilst retaining some strength just before PCT.