I used a JetBoil briefly. I found the tall cup to be unsatisfactory, and too small for many types of cooking.

The system is very quick and convenient. Set-up is quick. Windshield is in place. Ignition is quick and easy. It's clean. It's fast. It's efficient.

But a larger, differently shaped pot would have been better.

Over the long haul, the canisters can get expensive. This is relative, though. On a per-meal basis, it isn't much. Over the course of hundreds of meals it adds up. But it depends on whether that is a significant or insignificant amount of money for you -- it varies from person to person.

I like the white gas stoves for long trips.

Depends on how important the different factors are for you -- convenience, speed, cost and availability of fuel, weight, size, etc.

If you aren't touring in areas or ways that make the canisters hard to keep in stock; if you don't mind spending a little extra money on fuel; if you are happy with the pot (or can find one you are happy with); etc., the canister stoves are hard to beat.

As far as JetBoil systems compared to other canister stoves, that is a whole other ball game.

Primus makes some excellent, highly efficient canister stoves that would definitely be on my short list.