Ah, tysm!
I have to say, there isn't really much dialogue diversity... I wasn't expecting anyone to like it so much they'd replay it, haha
If you're okay with spoilers, then
I guess that never offering anything can lead to a couple of new and different text lines... Also if you chose one of the the guardians as your "favourite denizen" in naga's survey she'd get an extra line in the forth run... But that's about it!
Feel free to read the script.rpy file in game folder as well, if you have any code editing apps installed, it'd be way faster to skim through all the optional lines!