rds and/or WW... Any chance of contacting either of you outside of forums? Have some questions for both of you. Any hint and I'm sure I can find you or I am not unwilling to give my non-personal email out if you're willing to contact it. Thanks in advance.
As to the original question:
IMO and very much simplified... injectables will pass through the liver RELATIVELY undetected, thus causing no strain to the liver and the great majority of the compound enters the blood stream. Orals, particularly 19-nors, are designed to endure pass(es) through the liver without the main androgenic compound being broken down and thus cause unnecessary liver stress.
IMO, and from personal experience, stick to injectables (anyone afraid of needles, trust me, it's really no big deal except your first pin which can be nerve racking) unless you're fully prepared to have liver screens, blood work, etc. done regularly. AAS usage is a serious thing and, as Mr.WW has said time and time again, unless you have a competent source to check your various physiological markers you shouldn't use any form of AAS, particularily orals.
Unless you're a competitive BB, you have no reason to use much of anything outside of Test or MAYBE tren, if you're fairly experienced. Again, all IMO and I'm more than happy to be corrected if necessary.
TL;DR: Orals do hurt liver function, injectables do not. Unless you're a competitive BB, stick to injectables and you'll be happy, happy, happy with no other worries assuming you aren't incompetent about AI or PCT.