The answer is the rootstock will not affect the tree growing on it. The rootstock is there for a bridge to allow you to grow what you normally couldn’t. This goes for wet/dry soils, nutrient compatibility, insects, disease, precociousness, size of tree… all the things you might suspect. Remember it’s only a bridge to allow you to grow something further.
In the same token, if the tree you put on a rootstock is not a good match for the environment it’s growing in - it will always suffer to perpetuity.
My own take on both rootstock and tree is what I term “comparing climates.”
Will this tree grow here or will those roots grow here and you have to find good matches. That’s really it. Where does that tree grow in its’ natural range and what is the climate there for it and how does that climate correspond or compare to my mine. Then you start tweaking as best you can if you have to have it and are not supposed to.