I have the CA, and I love it. I haven't used it in a jet (or flown one at all) yet, but it's awesome with props, and I've read lots of people loving it in jets. From what I've seen people seem to almost universally like both the QT and CA, but those who have tried both seem to prefer the CA, for the most part. It's also more expensive, and so are the tips, so that could be a reason to go with the QT.

The Mach 1 has very mixed reviews, with lots of people citing fit issues. Last time I checked the Lightspeed website, it wasn't there, so I believe it's no longer in production.

I would definitely recommend the CA, but the QT is also very popular, so YMMV on that one.