In identical CAT (alcohol) stoves constructed of aluminum vs. steel, the steel stoves required twice as long to boil water as the aluminum. All other variables were held constant. This is evidently due to the superior heat transfer abilities of aluminum.

Anecdotally, some are disappointed with the performance of titanium alcohol stoves in cold weather. Titanium also does not conduct heat nearly as well as aluminum.

Brass, as in most Trangia stoves, does conduct heat about the same as aluminum, I believe.