You can pry my 1" threaded headsets and quill stems from my cold, dead hands.

* Better looking
* Easier to adjust stem height to suit rider position, especially on the road
* Greater range of adjustment
* Your fork and front wheel won't end up on the floor when you pull the stem out

Threadless steering system components only came about to save bicycle manufacturers money and to simplify their supply chain, with manufacturers saying "they're better" without any real data to back that up. And, because it was "newer, and therefore must be better", cyclists took the bait hook, line, and sinker. True, in the longer run, it allowed for things that could never happen with a threaded steerer, like carbon steerer tubes, but 99% of the population really doesn't need that.

/grumpy old man

Pete