Better fuel economy, Better sound. I would go with the four stroke. Even the dreaded throttle linkage isn't really that bad of a problem. I have yet to find a plane that I couldn't run a cable in sheith to the throttle and not have to make extra linkages or wild bends. Just plan ahead for the throttle linkage and you will be OK. I always use a ball link on the throttle, and I run into length issues with the threaded solder on end for the cable and the length of the ball socket. Shorten every thing up as far as you can and you will be OKfor rear travel of the throtle.

Don