Can anyone let me know what the pro's and con's are of each. I am looking into equipment for the fall. Alot of customers don't like the core aerators where cores left on the ground. A few years back I kind of recall an aerator that would also pick up the cores and mulch them and nicely lay it back on the ground. The main soil composition here is clay. I was thinking where it is clay that with a spike aerator I could use it in the fall spring and also in the summer with out having to reseed. Any comments or advice would be appreciated.