# Which is better: iodine number or bromine number?

The degree of unsaturation of fats can be determined with the help of two type of scale namely iodine number and bromine number.

Generally, iodine number is more preferred over bromine number (Is this statement true? Is it because the Wikipedia article of iodine number is more elaborated than that of bromine number?)

Iodine number is typically found out by using iodine monochloride, $$\ce{ICl}$$ where the iodine atom gets bonded with the carbon atom having double bond. The more iodine used up to break the $$\ce{C=C}$$ bonds, higher is the iodine number.

$$\ce{-CH=CH - + ICl -> -(I)CH-(Cl)CH - }$$

But in the 4th paragraph of the 1st page of this link, it is written that:

Iodination is an endothermic process, resulting in vicinal diiodides that tend to revert to alkenes. Consequently, the most common applications of alkene halogenation are chlorination and bromination.

So, in this context, bromination is better and thus bromine number is better than iodine number. The statement contradicts the previous statement i.e. using iodide number.

H.P.Kaufmann method of finding iodine number uses bromine. Is this a better method than using $$\ce{ICl}$$ considering the disadvantage of iodination?