In this case, I'd probably go with burning, but drowning makes you panic, before you realize that you are not longer panicked... but dead. Unlike fire, which you feel every agonizing moment, until death, rather than the sure chance that you pass out. Fire wouldn't have a 100% guarantee on unconciousness.

And temperature does matter. If it were only 60 degrees Celsius, then you would die rather slowly. If it were 90l, you die much faster. The faster you fry your nerves off, the faster you don't feel anything.