https://www.blackjackincolor.com/truecount4.htm
In this article, the graph shows a huge 0.25%(eyeballing the graph) difference in advantage between Floor and Round method. I've always using Floor method, but I wonder if the difference is that high?

https://www.qfit.com/CalculatingTrueCounts.htm
In this article, it says "Flooring and rounding are nearly equal in performance". I always thought rounding 1.6 to 2 is a mistake cause I should take deviation action when the TC is 2 or higher, 1.6 is lower than 2.

In Professional Blackjack by Stanford Wong, he suggests Truncating on page 37. Furthermore, on the deviation chart provided by Blackjack Apprenticeship, the deviation numbers are different than in Stanford Wong's book.
It's all the same Hi-lo counting system, why so many differences? I understand few different deviation numbers have little effect on performance, but the optimal choice has to be one. It boggles my mind for many years.