Back in the 80s, I used Suntour Superbe Pro. When Suntour died, I switched to DA (7 speed back in about 1988). It was great, as was the early 8 speed. I haven’t owned either 9 or 10 speed DA road groups.
In the mid 90s, I decided that my tri career was over, sold my QR (one of the really early ones - supposedly a custom frame from a small builder in California that cost a lot of money for those days) and decided to buy a good road bike that would last a long time. Having seen Shimano kill Suntour, I thought I’d do my bit to provide them with a little competition and bought Campy. I guess you’d call it a political decision rather than one made on the basis of attractiveness or function. 8 speed Chorus Ergo for my C40. I kept that bike for 11 seasons, upgrading something in most seasons from 1998 on. When I sold it, it was all Record 10 carbon.
Since 1995, I’ve bought a lot of bikes for myself or my two sons (more than a dozen). I’m a firm believer in the N+1 rule and am already planning next spring’s bike (and 2008 for that matter).
Except for my younger son’s first race bike and a couple of Cervelo TT bikes, all have been Campy. We all prefer it. In addition, we have had shifters rebuilt - two from crashes, three from age (>20,000 km). Much cheaper than replacement, which is what we would have required with Shimano.
We have one TT bike with Campy and one of the Cervelos had Campy shifters and rear derailleur since we couldn’t get the cassette body to convert our disc to Shimano. Both Shimano and Campy work well in this application.
Shimano controls the market in North America. That’s partially because of their size, partially because so many riders here are converted mountain bikers and think Shimano is the only make because of their previous experience. In Europe, you can buy Giants and Cannondales with Campy. Not here except for one very high end Cannondale.
Let’s face it. Both make really good products today. Some people have had a bad experience with one or the other, but Shimano and Campagnolo parts are light years ahead of FSA and the other parts manufacturers.
It will be interesting to see how SRAM works out. Compatible with Shimano wheels and cassettes so converting race wheels will be a cinch. Non-moveable brake lever so I wouldn’t be freaked out by the lever moving as I’m going downhill through a switchback. Might be worth trying.