I still prefer heavier denim though numbers no longer play any role in my choice of jeans. But I won't buy a pair I find flimsy and thin. Like I mentioned elsewhere, a right pair of Italian made Diesel jeans is what I've so far been happiest with and by far at that, but they're by no means light and I'd easily compare them to, I don't know, what IH sells under 18oz. As for durability of heavyweight jeans, I don't see why they wouldn't last you the same as any other pair, with the additional bonus of being much more damage-proof as 22+oz denim makes up for a really tough fabric. But I just don't see any logic behind any of the theories on why heavy denim would (not) last longer.