AAS injectables-(various testosterone esters, deca, eq, primo, masteron, Tren)most are not methylated, can be run for longer periods of time, long cycles allow for gains to be solidified due to body having time to become adjusted to new weight, for obvious reasons easy to run a test base, illegal without prescription, realistic sides(common not all inclusive) that many but NOT ALL experience:High BP, Lower HDL higher LDL, Raised Hematocrit, hair loss, suppresion of natural test levels, gyno, some users not all will require support products such as AI, SERMS, BP supps or meds, blood donating, HCG and so on.
Oral AAS traditional-(Dbol, Anadrol, Anavar, Winstrol) methylated( all but andriol as far as I know) so liver toxic, depending on compound gains can be quick and quite large(there are exceptions), do not lend themselves to long cycles due to methylation(some will run for long cycles and say that the liver concerns are overblown, hey it's your body do what you want but most would prefer to keep the time short) Sides are the same as above with the added risk of liver enzyme elevation and loss of libido due to not being the same as test(this is mediated by many by running injectable test. Illegal with out script.
Designer Oral AAS-(Dymethazine, M-sten, Halodrol, Epistane)These are the same as above but are currently not illegal to posses. They have less research and anecdotal evidence due to not being out as long as traditional oral AAS but by all accounts are just as potent. Legal at the moment(at least some still are.)
Prohormones:These are steroid hormones in structure but are not active at the AR(for the most part some such as the old 4-androstenediol had some intrinsic activity at the AR) until they are converted via enzymes in the body to active hormones. Due to being conversion dependent they are not as powerful as the above but offer certain advantages. Products such as BULK-UP, 4-AD, Alphamass, Stano and so on can be ran for longer than the above orals. PH are available that now convert to test and provide the all important test base that is commonly used by those running test injections with there cycles. The longer cycles that can be ran help solidify the gains, the conversion to test helps mediate side effects to a DEGREE, and the lack of methylation makes the TRUE PH far easier on the body. Some sides are still possible such as high BP in those who are very sensitive but IN GENERAL many find the ride much smoother with a good PH than the other orals mentioned above. They are currently legal. So PH can be run in longer cycles just like injects, support test levels like test injects, little to no liver issues like most injects and like I said are legal. Obviously I rep for a PH company so I think they are a nice option especially when ran as a test base with the above compounds but I am not blind there are differences and drawbacks, I won't lie to you and say you can achieve with PH's what you could with injects, you simple cannot. But you can achieve SOME of what you would with injects.
PH's being dependent on enzymes in the body and absorption will always have a ceiling as to how much converts and how much you can get into the system. With an inject the sky literally is the limit, to more you shoot the higher your levels will be plain and simple.
Once you are shut down it does not matter what got your there. If you run any of the above and your endogenous test is say 150 when you come off it will be equally hard to recover no matter what compound got you there.
So they all work, some are stronger, some are safer, some limit your time on if health is a concern, some are illegal some are not. It is the dose that makes the poison and only you can make the personal choice as to what you want to put in you. No matter what you do be safe!