Having tested quite a bit lately I can offer some of my thoughts.

I bought a Brunton Vapor AF for just the same reason, a stove that could burn both liquid and canister fuels. Initially I can say that the Brunton Vapor AF is a complete waste of money. They would have to have some exceptionally ideal lab conditions for that stove to boil 1L of water win 3.5 minutes. My boil times were closer to 14 minutes; compared to "my" standard, a Coleman 440, would boil 1L in about 3.5 minutes. As you can tell, I'm still quite PO'd about that little piece of marketing info. Brunton was great and allowed me to return the first stove, assuming there was something wrong with it. The new one was no better! Boil times are now down to 6.5 minutes, thanks to a #78 drill bit and a pin vise, without sacrificing liquid or canister fuel function or simmer ability. As a matter of fact, I think it simmers better with less noise due to the larger jet size. I'm sure it voids the warranty but otherwise the stove has great features and function and I really like the option of connecting a canister.

I also bought an Optimus Crux Lite (the non-fold able one) and really like that stove as well. Spec's stated the Crux would not simmer quite so good so I chose the Crux Lite. So far, boil times for 1L have been just under 4 minutes with a slightly noticeable decrease in output at the end of the canisters life. Nothing to date has been able to trump my old Coleman 440, boiling 1L consistently around 3:48 to 3:58. The Brunton Vapor is more stable and, although they both weight similar considering the whole package, the Brunton Vapor packs better.