You are right; ideally, it is a no brainer. There are 2 reasons I brought it up: 1. It didnt seem to have been addressed, and people may have misuderstood the statement of his conclusion. 2. Turbos, like most things, are classical optimization problems. It is my professional emperical opinion that the 16G is a better choice for our cars than the 20G. It is also my professional emperical opinion that the 20G has some level of diminishing return when compared to a 16G, price/performance wise.