wait a sec.....sides from nor and 1-ad are about the same?
1-ad is androgenic. people complain of hair loss from it. also, in general people feel sluggish on it b/c of low estrogen in the system since it's non-aromatizable, (so gyno is not an issue). stackin with 4-ad fixes this and the sex drive problems.
19-nor is supposed to convert to nandrolone, which can aromatize a little and cause gyno, but usually only at higher doses. i'm not sure of the exact way it does. do a search on deca or check the anabolic board if you wanna know. on top of this, the 19-nor molecule is can aromatize some too, especially the dione version. i believe it was pat arnold who explained this and said he's seen people get gyno from high doses of 19-nor. it can also lower the sex-drive. but nandrolone and therefore 19-nor are both very mild on the hair.
so it's up to you what you wanna mess with. general consensus is that 1-ad or 1-test are the best legal hormones. but i'd be careful if hair loss is an issue. as for 19-nor, i don't know how much of a problem gyno can be, it probably depends both on the person and the dosages, and from what most say, the gains are fairly mild. there's always exceptions, but for the most part it doesn't seem to impressive by itself.