I think you should just use multiple companies. Its not like either one is sponsoring you. i have a ball from all the major companies and working on getting one from the smaller ones like morich and possibly a visionary. I like to have everything for all kinds of lanes. I just got a roto grip, havn't thrown it cause its a dry lane ball and havn't got on those conditons. Really I like all of my equipment and people might say one hits harder then the other but full honesty if you bowl 12mph then your not going to be "hitting the pins like a truck" as some would say. But each of my balls are different and I know when I like to use them on certain lanes so really company doesn't matter, all of them are very good, just some match up with your game and lanes better then others. Out of the two listed I like Hammer more but thats cause I like the big backend reactions they give, but thats just me.