Bro, where do you get your information from? I wouldn't say it's equivalent 1000mg of test in 1 pill. Each compound is different, with different results...
It's an oral....it provides quick gains....it raises RBC (they use it for muscle wasting - anemic patients)....it's hard on the liver....it makes you bloat.....it can give you headaches.
These are the things that can happen. I wouldn't say that anadrol will make you the biggest, because it just wont. You might gain some size quickly, but a lot of it is water so once you stop taking it right off the bat you'll lose about 1/2 of your gains. Bam....that 15lbs suddenly turned into 7.5lbs....lets not forget the fat content from eating 4 weeks of Big Macs and whoppers...there's about 1/2 of that...lol....so you're left with a a whopping 3.25lbs of LBM. Not bad for a month, eh?
I'm not trying to flame you bro, but there are too many misconceptions out there about using gear. Its not a magic pill and none will make you huge over night. Expect to gain 10-20lbs each year your first couple of years on AAS...then after that 5lbs to at most 10lbs is usually acheivable.
Eating and training hard is what makes you huge...focus on diet first and foremost and use AAS as a supplement, and not the primary focus to building mass.