just like Elliot Kane, i prefer the dialogue system of Lionheart (which sadly for the rest of the game, they just fall very short) as it has indicator on the dialogue's intent & the dialogues are also driven by the race of the character as well as the stats (intelligence, perception) or skills (diplomacy). Lionheart uses SPECIAL system.

as for Neverwinter Nights, i would prefer the dialogues between party members as done in NWN: Hordes of the Underdark. it gives depth to henchmen. this is also done in Star Wars: Knights of the Old Republic, which was good.

worse comes to worse, i would fall back to DD's old system.

whatever the system, i feel that the content is the most critical component in making dialogues work.

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......a gift from LaFille......