i've noticed seals on X-ring chains tend to be more delicate. Have to be less rigorous with cleaning. That's part of the trade-off for less drivetrain drag.
The XW rings are somewhere in between X-ring and O-ring as far as drag goes. If you want tightest "feel" from chain, use O-ring. For loosest, least drag chain, use one without seals at all. That's what I have on my race-bike, frees up about 1.5-2.0 bhp. You can spin back tyre by hand and it just spins and spins and spins...