There are two ways to look at it:
Walmart - cheapest only, sacifice quality just to get it to work
others - value add, charge more
I think Exxon/Mobil/Esso falls in the second. Exxon/Mobil/Esso and BP's fuel is top tier quality in terms of additives and cleanliness, just not certified. They choose not to participate in the top tier program, due to constraints on other formula specs.
Hess is basic fuel. Basic additives to meet EPA mins. Nothing bad, nothing good. If you want no buildup overtime, look elsewhere. If you are getting rid of the car, it works fine.
What is such a mystery? This topic shows up all the time here.
Gasoline, pre-additive is a commodity and regulated. all the same. Post additive, it is very different and works much better for longer term. There's nothing to "feel" after a tank, unless it is contaminated. Additives work over the long time and you have to pay for it. Simple as that. Techron in a bottle or a brand that has it or you get carbon buildup after 50-70k.
Of course, any brand that isn't contaminated works "just fine" at the time, you simply don't trace the problems back to the fuel later.
All depends how long you keep your car.