Asters meth engines run more prototypical than the gas burner engines. Short of coal, its the closest you can get to realism (due to the draft system).
It really depends on what you want to run at the given moment, they both have pros and cons. Some people want to be as close as the real thing as they can get, others want more safety and ease of gas firing.
I am one of those that purposely got a meths loco because I wanted more nob's to turn. More stuff to tweak and play with when you run them.
This is also a hobby of "do-it-yourself" mostly, if you don't like it, change it ;-P There is a lot of fun to be had just figuring out how and your loco will be unique. (aside the small risk you take if you mess it up hehe)
It really depends on what you want to run at the given moment, they both have pros and cons. Some people want to be as close as the real thing as they can get, others want more safety and ease of gas firing.
I am one of those that purposely got a meths loco because I wanted more nob's to turn. More stuff to tweak and play with when you run them.
This is also a hobby of "do-it-yourself" mostly, if you don't like it, change it ;-P There is a lot of fun to be had just figuring out how and your loco will be unique. (aside the small risk you take if you mess it up hehe)