Disagree. It's Adelaide Inn based on popular opinion. Though personally if he smashes with SOL Spring and the Summer episodes SOL might take that spot
The narrative structure of SoL has prooven to be way too difficilt for NTRman to handle.
Adelaide Inn is "decent" for most people due to being pseudo episodic and the same goes for TotD with its 20 days structure but with RNG to spice things up, we would see if this RNG would be apply to events as well.
But going back to SoL I think if NTRman made the bookstore where the MC's Mom is working an important setting of the narrative he may have more familiar ground to work around(like the Tavern&Inn in Adelaide Inn or the apartment in TotD) instead of trying to create a more straight forward continuity with two options of ending at best, we even see a glimpse of its potential with the camp moms' cameo in the first chapter, but there is hope that SoL is actually a multi branch option kinda of VN which is probably the reason why NTRman is struggling so much with moving the story forward.
If he can pull out that then SoL not only would be a good VN but also a different one from Adelaide Inn and TotD.
Speaking of VNs. Im curious about Drussila and AotG structure, both seems to be a sandbox and we would need to travel in order to interact with objects and people and experience events in the story. Im looking forward to them, specially AotG.