As you might guess, I'm more or less new to this. Looked through MBTI for a while before discovering Socionics. It was actually over on Amino, if I remember correctly? But anyway, I find that it seems preferable since I reckon being relatively more informative usually makes up for the extra dose of complexity, as I suppose my own typology would have me inclined to think. Some specific topics that I'm not yet fully clued up on are the 2 additional enneagram types (since I find profiles where they often have 3 in total), as well as instinctual stacking (although it might be something like sp/sx or sx/sp, I guess?).
Well, hopefully that says just about enough for an introduction!