The numbers only indicate performance at a specific temp/humidity differential point. My understanding is that Goretex performance degrades rapidly as the temp/humidity differential decreases between the inside and the outside of the jacket. eVENT and MontBell's Breeze Dry Tec (BDT) laminate work well over a wider range of temp/humidity differential between inside and out.
Verber — the wp/b gear 'whor' par excellence — has eVENT jacket, MB's Peak Shell jacket (BDT laminate), and a host of Goretex jackets as well. Summarizing his posts from the past:
1. Both eVENT and BDT are much more breathable than any of the Goretex models.
2. eVENT is slightly more breathable than BDT.
If maximum breathability is paramount, I would go for eVENT — but would want one with decent venting options — regardless of Integral Designs' claim that eVENT is "so breathable" that venting isn't needed. Hog wash.
But eVENT is relatively expensive and heavy. I like MB's Peak Shell jacket — viewing it as an artful balance of high breathability performance, extensive features including super long pit zips, decent pricing (cheaper than most eVENT and Goretex jackets), and very light weight (lighter than most all eVENT and Goretex jackets, even with all the features).