You probably won't be able to tell much of a difference between any of those engines you mentioned b/c they all will give your plane plenty of power. I know HP numbers don't mean anything unless you want a race plane and you won't find torque listed anywhere but DA usually has a little more tq than the compitition and no one else has a smoother transition (didn't say no one elses is the same, just not better). The main thing I like about the DA is the reliability/ durability. You won't have to get a new ignition later on down the road since a lot of other people (3W) end up putting a DA ignition on their planes. And their customer service is by far the best. Thats something you won't find out until you have either had all of those engines or had a close buddy that has delt with them.

but oh well,
get what you want and good luck

John