Resource allocation practice

Hi,

My programme consists of huge excavation / area grading work for which we are going to use 6 excavators. We have divided the whole area in 6 parts and excavation gonna start in all the areas at same time, hence consurrent work. So in the programme I have to assign resources to these activities. So among the following which is the best practice:

1) create and assign a generic resource called Excavator to all the concurret activities which will show overallocation of resources

2) create resources Excavator 1, Excavator 2 , Excavator 3......, Excavator 6 and assign to relevant activity which will not show overallocation.

Please recommend which one shall be used.

Thanks.