What I want to say is this; I will follow the general rules of the purchased tool for minimising resource and there are plenty of coding styles that produce varying areas for the same task. But I wouldn't waste time (and hence money) on challenging the tool...
Saving resource is not only a matter of coding styles. Imagine you are to give the task of a "fractional upsampler" to some 100 new graduates or junior HDL engineers then wait and see how it is going to be implemented. The variation of time (and resource) could range from a couple of days to months. The resource will be vastly different. The code could range from one single readable short structured module to a hierrachy of multiple modules and submodules and subsubmodules. What I want to say here is that the human style is far more important than coding style. It is something that managers have no clear idea and no control.