It depends.
The amount of public lands varies between countries as well as between states/provinces/oblasts/... I generally avoid camping on private property without permission - and typically try to "wild camp" where I am not necessarily trying to hide in a "stealth camp" mode. Campgrounds themselves also vary pretty widely and where available I would often prefer a forest service campground with water and basic pit toilets to other more fancy commercial installations.
In Texas, there is not much public land, so my weekend camping get-a-ways are often at TX state parks. In more populated parts of the US, I am more likely to just find an inexpensive motel than camp. In parts of Argentina, Russia, Australia I have cycled there were larger stretches without much other than wild camping. In more populated India or Southeast Asia, it didn't make sense to not stay in inexpensive accommodations.
So I would say it depends a bit on where you are planning this tour...