Personaly i like rock/paper/scizzors/lizzard/Spock more ...
Since there is nothing more frustrating than keep loosing important decisions in dialogues bcs "right now you just rolled low". -_-
Also im honestly not quite sure how to feel about "pending untill all players will join the conversation" from tOR ...
I see its usefull, and i totally get it ... its just weird that whole world is standing still and wait for Bilbo to finish looting and join to you to talk. :-/
That would be what the modifiers to the roll is for, though. Generally the way it works in SWTOR is that there's a give and take in conversation- more often than not, in a four-player group, everyone will have the chance to say at least one line before the conversation is over, unless it's a particularly short conversation or the rolls go especially sideways. And personally, I would rather know that I at least have a chance to say something but roll poorly instead of what it is now, which is just "alright time to watch my friend play the game for the next five minutes or so."
Again I'll concede that the pending option maybe doesn't need to be there, if it would be preferred that things stay more fluid. I get that. I never minded the conversation pending in SWTOR, but that's just me.