I have the H9 which I intend to put a Saito 100 in, it is the next one I work on, there are two H9's at our field, one powered with a Saito 90, and the other with a YS 91, both excellent flyers.

We also have two WM .40 size, one in standard milatary trim and the other in Yellow (the Rockwell version).

They are both excellent flyers, the choice seems to me to be one of whether you want a .40 size or .60 size plane.

Your choice but this is one case where you really can't go wrong.

If you decide to go with the WM, check out the Yellow one, it is a great looking plane and different than the other Mustangs at the field,

This is type of decision that is win - win, both good choices

I would go for the H9, great looking ARF, in fact, I did.

Steve