I'll probably play both. Since the content will likely be somewhat different on the nympho route. It looks like the Dev intends to finish off the fucktoy route, before moving on to the nympho route. My guess is, the fucktoy route will only last a few more updates, because Lily has already told Goldberg that she'll do anything he asks, and after she's trained no doubt she will have completed her transformation into a no limit whore.
The nympho route is likely to take many more updates than the fucktoy route, because it will be much more slowburn, and will possibly lead to several different endings, whereas the fucktoy route will only have one. On the fucktoy route she has to leave Susan's house, and so it looks like that content won't be a part of it. Also the new friend that she makes, is told by Goldberg to leave her alone. It looks like they might have a lesbian relationship eventually, but it will only possibly happen on the nympho route? I think she could possibly end up with several different people on the nympho route, as well as a totally different slutty ending at the club? I also think we'll discover much more, about the mysteries of Grimwood, which perhaps won't happen on the fucktoy route?