Weird I could have sworn that I answered this very post...

Compared to the other .40 engines you list, and even to the GMS .32 and the ST G34... the OS LA .40 is less powerful.

As a result all of those engines will fly the planes faster if properly propped.

The closest to the LA will be the Magnum or the OS 25 FX.... although the LA would be more like a .30 FX.

The ST's are fine, but getting the midrange right is a bear at times.

The GMS's ( and the Tower Hobbies, which they make ... ) are fairly good, provided you leave them as is, run a few tanks through them, then tighten everything up, return and then fly...