what are you comparing? warforged con build vs drow dex build? you eat your apples and oranges mixed much?
the difference we talk about is (let's take a human)
8str, 16dex,14con, 8int, 8wis, 18 cha dex build
vs
8str, 8dex, 18con, 8int, 8wis, 18cha con build
or
8str, 8dex, 16con, 14int, 8wis, 18cha con/int build
keep the apples with apples... and in this case, the absolute max of 40 hit points more vs +4 reflex.