The OS 91FX and the (older) SuperTigre g90 are very capable pattern engines, once the modifications are carried out to make them work in a pattern environment.

i.e. pump to allow c.g. mounted fuel tank and a quiet tuned pipe.

I've had first hand experience with both and they're very good.

Having said that, if someone were to offer a piped and pumped motor (as the Hanno was) straight out of the box I'd snap it up.