Wings:

One of the main criterions in aircraft design is lowering the weight. If there are two engines of the same power differing only in weight, the lighter engine is better for that application, and the installation of the heavier engine would be considered the addition of dead weight.

The lighter engine is generally more expensive, though, and if the heavier engine gives satisfactory performance the lighter engine could also be considered a waste of money.

Building a scale model or assembling a scale ARF has limitations that do not allow extending the nose for balance with a lighter engine, if nose weight is required the heavier engine, being less expensive, is a good choice. At the same time, a larger more powerful engine of the same weight as the smaller heavy engine could also be considered the better choice.

Bill.