I might bat for slave route a bit here. Slave route suffers from them creating the world of that chapter, and then the slave route content for that chapter. Then love route comes and uses the same amount of effort creating the love route content and reusing a ton of the slave route world, so love route gets a notable level of polish that slave hasn't.Is not that it has less content per se, the thing is slave routes always come first so they added stuff, some people like it some pleople don't and with the feedback they create the love routes.
In that sense you may think that slave routes are just testing grounds for the love routes, but after book 2 the two routes are so different that imo you can't compare them.
I was going to get hyped for slave epilogue to get the same treatment but it seems like its attention is going to be split too with them retouching earlier scenes, implementing the gallery one chapter at a time and implementing slave epilogue in the same amount of time love epilogue got to only focus on love epilogue.