Prefer the carbon one, even without padded shorts. Harder to recommend them, after the few issues people have had, but at £18 its pretty disposable, as long as it doesn't go totally disposable whilst you're riding. That one is not too padded though by any means, which is nice
Carbon ones can be had for ~£18 if you look a bit.
http://www.aliexpress.com/item/2015-HOT-New-Carmmel-mtb-saddle-bicycle-soft-seat-for-cycling-racing-road-mountain-bike-parts/32258757363.html
Is the one I had on Monday