I used to prefer bat tops, growing up with arcades in the 90's pretty much all games here in the US had bat tops. However, I have made the switch, I find ball tops more comfortable, there are more ways to hold the stick. On top of that most top SF players use ball tops, they use ball tops in Japan, in addition:
Ball tops look better, IMHO, the shiny shafts look better than the dull plastic bats, and there are hundreds of different ball top colors and styles, makes it easier to match the sticks to buttons and your cab art.
You can light up ball tops