TiTs throws in a lot of shake ups to the standard "meet, talk, have sex" formula compared to either CoC.
Princess Nasty's games, Fisianna's dates (ugh), Bianca's random meetups, Ardias addiction, either of the two stalker NPCs theyve recently added....
Lots of characters have mechanics, or at the very least affection meters that change things as they progress.
TiTs has a real "throw it at the wall and see what sticks" approach that makes it into the buggy hot mess that it is, but also produces a large variety of inventive scenarios.
TiTs, imo, has the best porn out of all three games, even if I still like CoC2 a bit more.