Msr
I have used a bunch of stoves, and the MSR Dragonfly is without a doubt the best. Yes, it's a little heavier than the other stoves, but we're talking ounces here and in my estimation they are easily justified. When hiking, I have more variability on what I eat due to being able to adjust the flame, and it'll burn just about anything. This also means I can vary the fuel for winter camping, which is sweet as not everything will burn at -35°F, and cannisters are just about useless at that temperature. The wide fold-out base is also sweet for supporting larger pots, like when 3 of us go backpacking together. At full burn it uses 5 ml of fuel a minute (I did a burn test), so a 20 ounce bottle will last me about 128 minutes, at full burn, it'll do better at simmer. It'll boil a quart in around 4 minutes, which is respectable.
I have never had a problem with my Dragonfly, and the shaker jet technology makes it sweet as I've never even had to clean it. It is loud compared to a JetBoil though.
My older brother has had a Primus Hymalaya for many years now, and he loves it, but wishes he could vary the flame. It's a tank and has been through some rough times, but the all aluminum pump is nearly indestructable.
That being said, I was hiking the AT a few weeks ago and stayed at the Frye Notch shelter with Harry Potter/Batman, who had a JetBoil. I was impressed with how quiet it was, and it was faster at boiling water, but he said he was limited to certain foods with it. He had been on the same large cannister since Katahdin, about 3 weeks, and there was still plenty left to get him out of Maine. He did say he hated the cup though, as it was hard to clean, so he just poured the water into something else that was easier to clean.