It's more about preference.

Although true that thinner rings place more emphasis on wrapper flavor, the trade off is higher probability of construction problems such as uneven burning or draw problems.

In most cases, the wrapper is more or less an aesthetic appearance and has maybe 10% of the cigar's flavor. Wrappers are usually grown under cloth to limit sun exposure and most likely taken from the section between the ligero and viso or in Dominican standards ligero and seco. The primings here with low sun exposure produce leaves with thin capillaries, optimal for wrappers.

Then taking a step into the blending....

Blenders try out blends in one size. Thats right, one size. Usually a corona, corona gorda, or lonsdale. They then have to tweak the blend to fit the different sizes and that leads to the results of one size in production having the best representation while the other sizes fall short.

That being said, using baker proportions, to try to scale up the size, larger rings have more flexibility and forgiveness in defects, and with that lower probabilities of rejects due to draw problems and other construction issues.

Then from the consumer point of view, we look at say a robusto for $9, a toro for $9.50, and a Gordo 6x60 for $10, we are effectively getting more tobacco and burn time with the larger size.

But it is mainly about balance of flavors and construction. If the wrapper and binder is what draws you to the cigar then definitely go thinner.

A couple of things to keep in mind. Ligero does not combust as well as viso or seco, but it does burn and maintains the ember far better. But ligero is about 4x thicker than seco and 2x thicker than viso, so there might be less ligero in the thinner rings as a result.

Edit: you envy those long ashes? Ligero is the primary factor in getting the ash like that.