^THIS HE-AH, PEEPS^ Trenbolone is far and away the best bang for the buck. Nowhere near as toxic as widely reported and believed, delivers solid strength like nothing else, has an actual direct effect on fat, and perhaps best of all and least known - does not affect smooth muscle like the heart in the way that testosterone and its derivatives do. Tren is not a test derivative, its a prog derivative similar to deca. Think of deca as tren's kid sister. Both have the same parent molecule (progesterone) and both abide by the same house rules, but tren sneaks out the window and gets down where deca stays fairly tame and predictable.
As for why men use Anavar - um, because Anavar rocks when used properly. Its the closest thing to winstrol a guy can use in terms of cosmetic effect (of course winny is of singular efficacy in this regard, but markedly toxic and injurious to the body in many ways). Suggestions like the ones above, i.e. masteron, in reality do not live up to their popular reputations as so called 'finishing drugs'.
Your other examples of superdrol and dbol are not terribly good ones, insofar as both of these compounds promote excessive water retention and weight gain in general, including fat. It is widely argued that all steroids are the same, and none are so called 'fat burners', but this is erroneous and a concept more believed by virtue of being widely repeated as fact than by virtue of accuracy. Different steroids have different aspects to the way they manifest in the body, and depending on if that body is male or female, further differences arise. Its common to hear a novice say he wants winny for fat burning, whereupon an 'educated' bodybuilder will dutifully respond that no steroid burns fat and that any steroid can be effective in most every way. Again, BZZZT. Wrong. Winny and tren both DIRECTLY burn fat, whereas testosterone in general PROMOTES fat loss via indirect means and has no direct impact on fat stores. True, any given steroid can be effectively used in the context of BB, but most require knowledge and methodology that is either labor intensive or simply not generally known amongst the armchair BBers. Perhaps a more revealing question to ask if you want to understand var is: Why doesn't everyone use anavar? Short answer, price. All other reasons (fakes, availability, etc.) stem from this alone.
As for your suggestions about clenbuterol - no. Just no. There are a multitude of reasons to avoid clen altogether, and many of them have to do with severe health risks. Again, I must admit to being a clen junkie at a point in my past, but this was - again - the result of ignorance and inexperience. Clen is exciting to the newbie because of the immediate and very noticeable cosmetic effect it tends to impart. And I will not deny that it burns fat like a blast furnace as well as promotes strength gains better than many actual steroids. Trouble is, it can have dramatic effects on the heart and circulatory system, some of which can cause death, especially when used in conjunction with certain other compounds - which is exactly the way its used in bodybuilding. Truth is, clen is no longer used as a staple drug in pro bodybuilding. Amateur? Maybe. I dont know any amateur bodybuilders who use it though. And I know a fair number of pro athletes, bodybuilders included (most of them nearing or in the masters now lol) and screen actors who take a wide variety of cosmetic enhancers.
I would choose clen over DPT but that's about it.
Lastly, you specified winny for precomp - which is SPOT ON my man. Nothing works as well as fast, period. This includes HGH, which certainly is the best of all, but requires much more time and money and knowledge than good ol stanozolol. Winny is and always will be a staple finishing drug.