Let me start by saying I have never used a Jet Boil. My wife had one for backpacking but gave it up in favor of a Snow Peak. It was too big for her ultra lightness. If you want to boil water fast the MSR reactor is absolutely the fastest at all elevations, regardless of wind! Not sure the weight comparison between Jet Boil and the MSR maybe the MSR is a bit heavier?
I have the small Snow Peak Ti one that works well but needs a windscreen for best operation, not much simmer. Have used a MSR International for many years and still take it depending on what I want to cook/ where I am going.
Have used Espit & alcohol stoves, they all work.
Some are much more efficient/faster/reliable than others , which might matter when conditions are less than ideal and when you're really hungry!