Actually the quixel suite is not really cheaper for indies than substnace painter, and SP is much more powerfull in my opinion.
When buying quixel you have to keep in mind that you need photoshop and the current version DDO is full of bugs. Take a look at
polycount forum, a lot of people are really unhappy with quixel, the support is also not that good. .I guess they are busy with the megascans.
And on the other site allegorythmic support is really good and they apps are like bug free…