Sometimes the blue circles fill up the bar quicker. I guess it depends on what the other character is interested in (Serious, Playful, Unique). Just try a green one and a blue one and then stick with what's better. Triangles never did anything good for me. And I also can't figure out what triggers the "Chance Time". They always appear right before the bar is full anyway, so just another wasted loading screen.
I've had a Chance Time after only choosing triangles. (I had nothing else to choose from)
So I guess it's mostly random, but the chance is higher after several good choices.
But after several good choices the bar is mostly filled. So Chance Time usually happens when it's pointless...
But all of this does not matter anyway. The skills are rising so fast, just do
something and the skills are close to ten in no time. Which means plenty of circles. You can talk anyone from stranger to lover in one go.
Less grind is good, but reducing the grind so much that all these fancy game mechanics are meaningless is quite silly.
Another Illusion game, another disappointing fuck up.