I work at a big box store and yes, picking a brand (and a product within the brand) is the first step for quality control.
There are differences between topsoil, lawn soil, raised bed soil, garden soil,
organic potting soil, potting
soil and potting
mix. They are all supposed to be different, so please don't expect them to be comparable.
And now my rant:
In whatever genre of products that you are most familiar with, be they hard goods (even lawn mowers) or plants, producers are forced to cater to the general public's wants, even if those wants are ill placed. for instance, we sell two types of topsoil: one that is a heavy black muck and one that is black, but is not as paste-like, and also has some sand mixed into it. People go for the black paste as soon as they see a grain of sand in the other
, even though all land plants hate growing in paste substrate and even though the muck is more expensive.
My point is that there are reasons why producers are leaning toward mulchy materials. Yes, they are becoming cheaper for them to use, because the more traditional alternatives have finite sources of raw materials, the depletion of which will impact the environment in the future. So the change (i.e. using recyclable materials) is a good thing, environmentally speaking. The other reason is customer demand. The general public can't seem to figure out that watering and fertilizer isn't the solution to every problem. So producers have to make mixes that drain better to accommodate the general public's "knowledge", and give them what they think they want. It's sad, but the truth in every facet of commerce.
So if you picked up on that last part, you just need to water and fertilize more in mulchy materials until the organic components break down. Plants really do love growing in light, airy substrates. And mulchy materials inherently have a better balance soil flora. Just look at nature's forest floor or prairie soils.
edited for grammar