I strongly recommend the spur, it will save you a lot of money because you won't have to have as many pads at hand and it will extend the life of the pad. However, it will increase your time spent working on the car a bit (but not significantly IMO) since you have to stop to spur, but it does not take too long. In addition, if the car was not clayed before polish (which I recommend be done), the pads will get really dirty and you will end up using more pads even if you spur. I once did a car that was so filthy, but the owner did not want me to clay it and I ended up going through several pads. Also, using too much polish can result caking and having to use many pads.