I have no doubt that by the time Tides of Succession is done, it will be in the conversation for AVN with best branching. Not only will your choices impact which LI you pursue, but they'll also influence the direction of the story (although, the story will never split into entirely separate paths to keep the workload reasonable). My aim with pathing is realism -> each character will react realistically to the situation presented in front of them.
Each major Love path (there are 3 major Love paths - one for each LI) will also have its own variations which will significantly alter the feel of the path. For example, Lorelei's Love Path is the major path, but its variations are Possessive Lorelei, Sweet Lorelei and Partner Lorelei. Each of these minor paths will result in Lorelei's ending and will have similar content throughout, but there will be many variations between the 3 of them, to the point where it would be worth it to do another play-through to see a different 'minor' variation.
With regards to plot branching, Allegiance Paths are going to play a huge role early on. Alas, as the primary conflict emerges and the priorities of the characters start to aline more with one another, the Allegiance Paths will have a less of an impact on the story.
In the upcoming release of Chapter 1.5, there will be a grand total of 9 dialogue lines that every player is guaranteed to see. The rest are hidden behind either Allegiance paths or love paths.